8 Reasons The Voight-Kampff Machine is shit (and a redesign to fix it)

Distinguishing replicants from humans is a tricky business. Since they are indistinguishable biologically, it requires an empathy test, during which the subject hears empathy-eliciting scenarios and watched carefully for telltale signs such as, “capillary dilation—the so-called blush response…fluctuation of the pupil…involuntary dilation of the iris.” To aid the blade runner in this examination, they use a portable machine called the Voight-Kampff machine, named, presumably, for its inventors.

The device is the size of a thick laptop computer, and rests flat on the table between the blade runner and subject. When the blade runner prepares the machine for the test, they turn it on, and a small adjustable armature rises from the machine, the end of which is an intricate piece of hardware, housing a powerful camera, glowing red.

The blade runner trains this camera on one of the subject’s eyes. Then, while reading from the playbook book of scenarios, they keep watch on a large monitor, which shows an magnified image of the subject’s eye. (Ostensibly, anyway. More on this below.) A small bellows on the subject’s side of the machine raises and lowers. On the blade runner’s side of the machine, a row of lights reflect the volume of the subject’s speech. Three square, white buttons sit to the right of the main monitor. In Leon’s test we see Holden press the leftmost of the three, and the iris in the monitor becomes brighter, illuminated from some unseen light source. The purpose of the other two square buttons is unknown. Two smaller monochrome monitors sit to the left of the main monitor, showing moving but otherwise inscrutable forms of information.

In theory, the system allows the blade runner to more easily watch for the minute telltale changes in the eye and blush response, while keeping a comfortable social distance from the subject. Substandard responses reveal a lack of empathy and thereby a high probability that the subject is a replicant. Simple! But on review, it’s shit. I know this is going to upset fans, so let me enumerate the reasons, and then propose a better solution.

-2. Wouldn’t a genetic test make more sense?

If the replicants are genetically engineered for short lives, wouldn’t a genetic test make more sense? Take a drop of blood and look for markers of incredibly short telomeres or something.

-1. Wouldn’t an fMRI make more sense?

An fMRI would reveal empathic responses in the inferior frontal gyrus, or cognitive responses in the ventromedial prefrontal gyrus. (The brain structures responsible for these responses.) Certinaly more expensive, but more certain.

0. Wouldn’t a metal detector make more sense?

If you are testing employees to detect which ones are the murdery ones and which ones aren’t, you might want to test whether they are bringing a tool of murder with them. Because once they’re found out, they might want to murder you. This scene should be rewritten such that Leon leaps across the desk and strangles Holden, IMHO. It would make him, and other blade runners, seem much more feral and unpredictable.

(OK, those aren’t interface issues but seriously wtf. Onward.)

1. Labels, people

Controls needs labels. Especially when the buttons have no natural affordance and the costs of experimentation to discover the function are high. Remembering the functions of unlabeled controls adds to the cognitive load for a user who should be focusing on the person across the table. At least an illuminated button helps signal the state, so that, at least, is something.

 2. It should be less intimidating

The physical design is quite intimidating: The way it puts a barrier in between the blade runner and subject. The fact that all the displays point away from the subject. The weird intricacy of the camera, its ominous HAL-like red glow. Regular readers may note that the eyepiece is red-on-black and pointy. That is to say, it is aposematic. That is to say, it looks evil. That is to say, intimidating.

I’m no emotion-scientist, but I’m pretty sure that if you’re testing for empathy, you don’t want to complicate things by introducing intimidation into the equation. Yes, yes, yes, the machine works by making the subject feel like they have to defend themselves from the accusations in the ethical dilemmas, but that stress should come from the content, not the machine.

2a. Holden should be less intimidating and not tip his hand

While we’re on this point, let me add that Holden should be less intimidating, too. When Holden tells Leon that a tortoise and a turtle are the same thing, (Narrator: They aren’t) he happens to glance down at the machine. At that moment, Leon says, “I’ve never seen a turtle,” a light shines on the pupil and the iris contracts. Holden sees this and then gets all “ok, replicant” and becomes hostile toward Leon.

In case it needs saying: If you are trying to tell whether the person across from you is a murderous replicant, and you suddenly think the answer is yes, you do not tip your hand and let them know what you know. Because they will no longer have a reason to hide their murderyness. Because they will murder you, and then escape, to murder again. That’s like, blade runner 101, HOLDEN.

3. It should display history 

The glance moment points out another flaw in the interface. Holden happens to be looking down at the machine at that moment. If he wasn’t paying attention, he would have missed the signal. The machine needs to display the interview over time, and draw his attention to troublesome moments. That way, when his attention returns to the machine, he can see that something important happened, even if it’s not happening now, and tell at a glance what the thing was.

4. It should track the subject’s eyes

Holden asks Leon to stay very still. But people are bound to involuntarily move as their attention drifts to the content of the empathy dilemmas. Are we going to add noncompliance-guilt to the list of emotional complications? Use visual recognition algorithms and high-resolution cameras to just track the subject’s eyes no matter how they shift in their seat.

5. Really? A bellows?

The bellows doesn’t make much sense either. I don’t believe it could, at the distance it sits from the subject, help detect “capillary dilation” or “ophthalmological measurements”. But it’s certainly creepy and Terry Gilliam-esque. It adds to the pointless intimidation.

6. It should show the actual subject’s eye

The eye color that appears on the monitor (hazel) matches neither Leon’s (a striking blue) or Rachel’s (a rich brown). Hat tip to Typeset in the Future for this observation. His is a great review.

7. It should visualize things in ways that make it easy to detect differences in key measurements

Even if the inky, dancing black blob is meant to convey some sort of information, the shape is too organic for anyone to make meaningful readings from it. Like seriously, what is this meant to convey?

The spectrograph to the left looks a little more convincing, but it still requires the blade runner to do all the work of recognizing when things are out of expected ranges.

8. The machine should, you know, help them

The machine asks its blade runner to do a lot of work to use it. This is visual work and memory work and even work estimating when things are out of norms. But this is all something the machine could help them with. Fortunately, this is a tractable problem, using the mighty powers of logic and design.

Pupillary diameter

People are notoriously bad at estimating the sizes of things by sight. Computers, however, are good at it. Help the blade runner by providing a measurement of the thing they are watching for: pupillary diameter. (n.b. The script speaks of both iris constriction and pupillary diameter, but these are the same thing.) Keep it convincing and looking cool by having this be an overlay on the live video of the subject’s eye.

So now there’s some precision to work with. But as noted above, we don’t want to burden the user’s memory with having to remember stuff, and we don’t want them to just be glued to the screen, hoping they don’t miss something important. People are terrible at vigilance tasks. Computers are great at them. The machine should track and display the information from the whole session.

Note that the display illustrates radius, but displays diameter. That buys some efficiencies in the final interface.

Now, with the data-over-time, the user can glance to see what’s been happening and a precise comparison of that measurement over time. But, tracking in detail, we quickly run out of screen real estate. So let’s break the display into increments with differing scales.

There may be more useful increments, but microseconds and seconds feel pretty convincing, with the leftmost column compressing gradually over time to show everything from the beginning of the interview. Now the user has a whole picture to look at. But this still burdens them into noticing when these measurements are out of normal human ranges. So, let’s plot the threshold, and note when measurements fall outside of that. In this case, it feels right that replicants display less that normal pupillary dilation, so it’s a lower-boundary threshold. The interface should highlight when the measurement dips below this.

Blush

I think that covers everything for the pupillary diameter. The other measurement mentioned in the dialogue is capillary dilation of the face, or the “so-called blush response.” As we did for pupillary diameter, let’s also show a measurement of the subject’s skin temperature over time as a line chart. (You might think skin color is a more natural measurement, but for replicants with a darker skin tone than our two pasty examples Leon and Rachel, temperature via infrared is a more reliable metric.) For visual interest, let’s show thumbnails from the video. We can augment the image with degree-of-blush. Reduce the image to high contrast grayscale, use visual recognition to isolate the face, and then provide an overlay to the face that illustrates the degree of blush.

But again, we’re not just looking for blush changes. No, we’re looking for blush compared to human norms for the test. It would look different if we were looking for more blushing in our subject than humans, but since the replicants are less empathetic than humans, we would want to compare and highlight measurements below a threshold. In the thumbnails, the background can be colored to show the median for expected norms, to make comparisons to the face easy. (Shown in the drawing to the right, below.) If the face looks too pale compared to the norm, that’s an indication that we might be looking at a replicant. Or a psychopath.

So now we have solid displays that help the blade runner detect pupillary diameter and blush over time. But it’s not that any diameter changes or blushing is bad. The idea is to detect whether the subject has less of a reaction than norms to what the blade runner is saying. The display should be annotating what the blade runner has said at each moment in time. And since human psychology is a complex thing, it should also track video of the blade runner’s expressions as well, since, as we see above, not all blade runners are able to maintain a poker face. HOLDEN.

Anyway, we can use the same thumbnail display of the face, without augmentation. Below that we can display the waveform (because they look cool), and speech-to-text the words that are being spoken. To ensure that the blade runner’s administration of the text is not unduly influencing the results, let’s add an overlay to the ideal intonation targets. Despite evidence in the film, let’s presume Holden is a trained professional, and he does not stray from those targets, so let’s skip designing the highlight and recourse-for-infraction for now.

Finally, since they’re working from a structured script, we can provide a “chapter” marker at the bottom for easy reference later.

Now we can put it all together, and it looks like this. One last thing we can do to help the blade runner is to highlight when all the signals indicate replicant-ness at once. This signal can’t be too much, or replicants being tested would know from the light on the blade runner’s face when their jig is up, and try to flee. Or murder. HOLDEN.

For this comp, I added a gray overlay to the column where pupillary and blush responses both indicated trouble. A visual designer would find some more elegant treatment.

If we were redesigning this from scratch, we could specify a wide display to accomodate this width. But if we are trying to squeeze this display into the existing prop from the movie, here’s how we could do it.

Note the added labels for the white squares. I picked some labels that would make sense in the context. “Calibrate” and “record” should be obvious. The idea behind “mark” is an easy button for the blade runner to press when they see something that looks weird, like when doctors manually annotate cardiograph output.

Lying to Leon

There’s one more thing we can add to the machine that would help out, and that’s a display for the subject. Recall the machine is meant to test for replicant-ness, which happens to equate to murdery-ness. A positive result from the machine needs to be handled carefully so what happens to Holden in the movie doesn’t happen. I mentioned making the positive-overlay subtle above, but we can also make a placebo display on the subject’s side of the interface.

The visual hierarchy of this should make the subject feel like its purpose is to help them, but the real purpose is to make them think that everything’s fine. Given the script, I’d say a teleprompt of the empathy dilemma should take up the majority of this display. Oh, they think, this is to help me understand what’s being said, like a closed caption. Below the teleprompt, at a much smaller scale, a bar at the bottom is the real point.

On the left of this bar, a live waveform of the audio in the room helps the subject know that the machine is testing things live. In the middle, we can put one of those bouncy fuiget displays that clutters so many sci-fi interfaces. It’s there to be inscrutable, but convince the subject that the machine is really sophisticated. (Hey, a diegetic fuiget!) Lastly—and this is the important part—An area shows that everything is “within range.” This tells the subject that they can be at ease. This is good for the human subject, because they know they’re innocent. And if it’s a replicant subject, this false comfort protects the blade runner from sudden murder. This test might flicker or change occasionally to something ambiguous like “at range,” to convey that it is responding to real world input, but it would never change to something incriminating.

This way, once the blade runner has the data to confirm that the subject is a replicant, they can continue to the end of the module as if everything was normal, thank the replicant for their time, and let them leave the room believing they passed the test. Then the results can be sent to the precinct and authorizations returned so retirement can be planned with the added benefit of the element of surprise.

OK

Look, I’m sad about this, too. The Voight-Kampff machine is cool. It fits very well within the art direction of the Blade Runner universe. This coolness burned the machine into my memory when I saw this film the first dozen times, but despite that, it just doesn’t stand up to inspection. It’s not hopeless, but does need a lot of thinkwork and design to make it really fit to task, and convincing to us in the audience.

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Routing Board

When the two AIs Colossus and Guardian are disconnected from communicating with each other, they try and ignore the spirit of the human intervention and reconnect on their own. We see the humans monitoring Colossus’ progress in this task on big board in the U.S. situation room. It shows a translucent projection map of the globe with white dots representing data centers and red icons representing missiles. Beneath it, glowing arced lines illustrate the connection routes Colossus is currently testing. When it finds that a current segment is ineffective, that line goes dark, and another segment extending from the same node illuminates.

For a smaller file size, the animated gif has been stilled between state changes, but the timing is as close as possible to what is seen in the film.

Forbin explains to the President, “It’s trying to find an alternate route.”

A first in sci-fi: Routing display 🏆

First, props to Colossus: The Forbin Project for being the first show in the survey to display something like a routing board, that is, a network of nodes through which connections are visible, variable, and important to stakeholders.

Paul Baran and Donald Davies had published their notion of a network that could, in real-time, route information dynamically around partial destruction of the network in the early 1960s, and this packet switching had been established as part of ARPAnet in the late 1960s, so Colossus was visualizing cutting edge tech of the time.

This may even be the first depiction of a routing display in all of screen sci-fi or even cinema, though I don’t have a historical perspective on other genres, like the spy genre, which is another place you might expect to see something like this. As always, if you know of an earlier one, let me know so I can keep this record up to date and honest.

A nice bit: curvy lines

Should the lines be straight or curvy? From Colossus’ point of view, the network is a simple graph. Straight lines between its nodes would suffice. But from the humans’ point of view, the literal shape of the transmission lines are important, in case they need to scramble teams to a location to manually cut the lines. Presuming these arcs mean that (and not just the way neon in a prop could bend), then the arcs are the right display. So this is good.

But, it breaks some world logic

The board presents some challenges with the logic of what’s happening in the story. If Colossus exists as a node in a network, and its managers want to cut it off from communication along that network, where is the most efficient place to “cut” communications? It is not at many points along the network. It is at the source.

Imagine painting one knot in a fishing net red and another one green. If you were trying to ensure that none of the strings that touch the red knot could trace a line to the green one, do you trim a bunch of strings in the middle, or do you cut the few that connect directly to the knot? Presuming that it’s as easy to cut any one segment as any other, the fewer number of cuts, the better. In this case that means more secure.

The network in Colossus looks to be about 40 nodes, so it’s less complicated than the fishing net. Still, it raises the question, what did the computer scientists in Colossus do to sever communications? Three lines disappear after they cut communications, but even if they disabled those lines, the rest of the network still exists. The display just makes no sense.

Before, happy / After, I will cut a Prez

Per the logic above, they would cut it off at its source. But the board shows it reaching out across the globe. You might think maybe they just cut Guardian off, leaving Colossus to flail around the network, but that’s not explicitly said in the communications between the Americans and the Russians, and the U.S. President is genuinely concerned about the AIs at this point, not trying to pull one over on the “pinkos.” So there’s not a satisfying answer.

It’s true that at this point in the story, the humans are still letting Colossus do its primary job, so it may be looking at every alternate communication network to which it has access: telephony, radio, television, and telegraph. It would be ringing every “phone” it thought Guardian might pick up, and leaving messages behind for possible asynchronous communications. I wish a script doctor had added in a line or three to clarify this.

  • FORBIN
  • We’ve cut off its direct lines to Guardian. Now it’s trying to find an indirect line. We’re confident there isn’t one, but the trouble will come when Colossus realizes it, too.

Too slow

Another thing that seems troubling is the slow speed of the shifting route. The segments stay illuminated for nearly a full second at a time. Even with 1960s copper undersea cables and switches, electronic signals should not take that long. Telephony around the world was switched from manual to automatic switching by the 1930s, so it’s not like it’s waiting on a human operating a switchboard.

You’re too slow!

Even if it was just scribbling its phone number on each network node and the words “CALL ME” in computerese, it should go much faster than this. Cinematically, you can’t go too fast or the sense of anticipation and wonder is lost, but it would be better to have it zooming through a much more complicated network to buy time. It should feel just a little too fast to focus on—frenetic, even.

This screen gets 15 seconds of screen time, and if you showed one new node per frame, that’s only 360 states you need to account for, a paltry sum compared to the number of possible paths it could test across a 38 node graph between two points.

Plus the speed would help underscore the frightening intelligence and capabilities of the thing. And yes I understand that that is a lot easier said than done nowadays with digital tools than with this analog prop.

Realistic-looking search strategies

Again, I know this was a neon, analog prop, but let’s just note that it’s not testing the network in anything that looks like a computery way. It even retraces some routes. A brute force algorithm would just test every possibility sequentially. In larger networks there are pathfinding algorithms that are optimized in different ways to find routes faster, but they don’t look like this. They look more like what you see in the video below. (Hat tip to YouTuber gray utopia.)

This would need a lot of art direction and the aforementioned speed, but it would be more believable than what we see.

What’s the right projection?

Is this the right projection to use? Of course the most accurate representation of the earth is a globe, but it has many challenges in presenting a phenomenon that could happen anywhere in the world. Not the least of these is that it occludes about half of itself, a problem that is not well-solved by making it transparent. So, a projection it must be. There are many, many ways to transform a spherical surface into a 2D image, so the question becomes which projection and why.

The map uses what looks like a hand-drawn version of Peirce quincuncial projection. (But n.b. none of the projection types I compared against it matched exactly, which is why I say it was hand-drawn.) Also those longitude and latitude lines don’t make any sense; though again, a prop. I like that it’s a non standard projection because screw Mercator, but still, why Peirce? Why at this angle?

Also, why place time zone clocks across the top as if they corresponded to the map in some meaningful way? Move those clocks.

I have no idea why the Peirce map would be the right choice here, when its principle virtue is that it can be tessellated. That’s kind of interesting if you’re scrolling and can’t dynamically re-project the coastlines. But I am pretty sure the Colossus map does not scroll. And if the map is meant to act as a quick visual reference, having it dynamic means time is wasted when users look to the map and have to orient themselves.

If this map was only for tracking issues relating to Colossus, it should be an azimuthal map, but not over the north pole. The center should be the Colossus complex in Colorado. That might be right for a monitoring map in the Colossus Programming Office. This map is over the north pole, which certainly highlights the fact that the core concern of this system is the Cold War tensions between Moscow and D.C. But when you consider that, it points out another failing. 

Later in the film the map tracks missiles (not with projected paths, sadly, but with Mattel Classic Football style yellow rectangles). But missiles could conceivably come from places not on this map. What is this office to do with a ballistic-missile submarine off of the Baja peninsula, for example? Just wait until it makes its way on screen? That’s a failure. Which takes us to the crop.

Crop

The map isn’t just about missiles. Colossus can look anywhere on the planet to test network connections. (Even nowadays, near-earth orbit and outer space.) Unless the entire network was contained just within the area described on the map, it’s excluding potentially vital information. If Colossus routed itself through through Mexico, South Africa, and Uzbekistan before finally reconnecting to Guardian, users would be flat out of luck using that map to determine the leak route. And I’m pretty sure they had a functioning telephone network in Mexico, South Africa, and the Balkan countries in the 1960s.

This needs a complete picture

SInce the missiles and networks with which Colossus is concerned are potentially global, this should be a global map. Here I will offer my usual fanboy shout-outs to the Dymaxion and Pacific-focused Waterman projection for showing connectedness and physical flow, but there would be no shame in showing the complete Peirce quincuncial. Just show the whole thing.

Maybe fill in some of the Pacific “wasted space” with a globe depiction turned to points of interest, or some other fuigetry. Which gives us a new comp something like this.

I created this proof of concept manually. With more time, I would comp it up in Processing or Python and it would be even more convincing. (And might have reached London.)

All told, this display was probably eye-opening for its original audience. Golly jeepers! This thing can draw upon resources around the globe! It has intent, and a method! And they must have cool technological maps in D.C.! But from our modern-day vantage point, it has a lot to learn. If they ever remake the film, this would be a juicy thing to fully redesign.

Control Room Power Board

image00

Once Dr. Sattler restores power to the park, Arnold needs to reboot the computer systems. To do this, he must switch off the circuits (C1–C3 in the screenshot above), and then switch off-and-on a circuit labeled “Main”.

image01

It’s a good thing Arnold knows what he’s doing, since these switches are only labeled C1-3, and we don’t see any documentation in the camera frame.  As he turns off each circuit, different parts of the computer terminals in the Control Room shut down.  This implies that different computer banks are tied to the same power circuits as the systems they control.

So, since this is a major interface for the park, let’s make this bit explicit: When designing infrequently-used but mission-critical interfaces, take great care to explain use, using clear affordances and constraints so that mistakes are very, very difficult to make. 

It might look like a mistake to have all the little electrical labeling to the sides, since this cover would have to be removed to get the components where this information would be of use. But that’s perfect. A user needing to remove this panel must encounter this reference information to get to those components, and so would know where to find them. This is a brilliant example of the pattern Put the Signal in the Path. Let’s hope there are similar signs on other access panels.

image02

Wait…where are the backups?

These are the central computer terminals that run Jurassic Park, and keep visitors safe from the “attractions.”  And there is no backup power.

When Arnold turns off the main circuit breaker, the computers (and servers behind them) turn off immediately.  The purpose and effect of the power switch deactivates all the systems in Jurassic Park, without any kind of warning or backup system.

For something as dangerous as deadly deadly dinosaurs—raised from the 65 million-year deep grave of extinction—the system deactivation should at least trigger some kind of warning.

Tornado sirens have backup batteries in case the city power goes out.  They are a solid example of a backup system that should exist, at minimum, to warn park-goers to move quickly towards shelter.  A better backup system would be a duplicate server system that automatically activates all the fences in the park.

Redundant Systems

When Arnold cycles the visitor center’s power system, it also trips the breakers for all of the other power systems in the park.  Primary safety systems like that should be on their own circuit.  It’s ok if the fridges turn off and melt the ice cream (though it may be an inconvenience), but that same event shouldn’t also deactivate the velociraptor pen security.  Especially when the ‘raptor pen is right next to the visitor center and is a known, aforementioned, deadly deadly threat.

Shadowy videoconferencing room

After Loki gets away with the crazy-powerful tesseract and a handful of S.H.I.E.L.D. (seriously that’s a pain to type) agents, Fury has a virtual meeting with members of the World Security Council—which is shadowy in appearance and details. To conduct this furtive conference Fury walks into a room custom-built for such purposes.

Avengers-Shadowy-Videoconference02

A bank of large vertically-mounted monitors forms a semicircle in the small room, each mounted above a workstation with keyboard and multiple screens overlit for maximum eyestrain. It’s quite unclear what the agents who normally work here are currently doing, or what those vertically mounted screens normally display, since they’d be a shoo-in for an OSHA lawsuit, given the amount a user would need to crane. Ergonomics, Nick, look it up.

Avengers-Shadowy-Videoconference03

 

Each screen dedicates most of its real estate to a waist-up view of the speaker. Overlays near the bottom assure us that DATA [is] SECURE and confirms it with a 16-character alphanumeric CYPHER KEY that is frequently changing and unique to each speaker. This is similar to an HMAC-based One-time Password Algorithm (HOTP) password algorithm, so is well-grounded in reality. It’s convincing.

The screens adhere to the trope that every screen is a camera. Nick looks at their eyes and they look right back. Ordinarily that would be a big problem, but with the translucent displays and the edge lighting of the participants, it could actually work.

There is no indication of controls for these screens, but that’s cool if the room is dedicated to this purpose. Someone else would set the call up for him, and all he has to do is walk in. He should be able to just walk out to end it. And let them know how he feels about them.

The SandPhone

LogansRun037

Not everyone is comfortable giving over to the flimsy promise of Carrousel [sic]. Some citizens run, and Sandmen find and terminate these cultural heretics.

Sandmen carry a device with them that has many different uses. It goes unnamed in the movie, so let’s just call it the SandPhone. It is a thick black rectangle about 20cm at its long edge, about the size of a very large cell phone. Near the earpiece on one broad side is a small screen for displaying text and images. Below that is a white line. The lower half of this face is metallic grill that covers a microphone. On the left edge is a momentary button that allows talking. Just above this is a small red button. When not in use, the device is holstered on the sandman’s belt.

The SandPhone lets the Sandman receive information through a display that can show both image and text. The Sandman sends back information and requests by voice in a CB radio metaphor.

Notifications

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