Deckard’s Front Door Key

I’m sorry. I could have sworn in advance that this would be a very quick post. One or two paragraphs.

  • Narrator
  • It wasn’t.

Exiting his building’s elevator, Deckard nervously pulls a key to his apartment from his wallet. The key is similar to a credit card. He inserts one end into a horizontal slot above the doorknob, and it quickly *beeps*, approving the key. He withdraws the key and opens the door.

The interaction…

…is fine, mostly. This is like a regular key, i.e. a physical token that is presented to the door to be read, and access granted or denied. If the interaction took longer than 0.1 second it would be important to indicate that the system was processing input, but it happens nearly instantaneously in the scene.

A complete review would need to evaluate other use cases.

  • How does it help users recover when the card is inserted incorrectly?
  • How does it reject a user when it is not the right key or the key has degraded too far to be read?

But of what we do see: the affordance is clear, being associated with the doorknob. The constraints help him know the card goes in lengthwise. The arrows help indicate which way is up and the proper orientation of the card. It could be worse.

A better interaction might arguably be no interaction, where he can just approach the door, and a key in his pocket is passively read, and he can just walk through. It would still need a second factor for additional security, and thinking through the exception use cases; but even if we nailed it, the new scene wouldn’t give him something to nervously fumble because Rachel is there, unnerving him. That’s a really charming character moment, so let’s give it a pass for the movie.


A small LED would help it be more accessible to deaf users to know if the key has been accepted or rejected.

The printing

The key has some printing on it. It includes the set of five arrows pointing the direction the key must be inserted. Better would be a key that either used physical constraints to make it impossible to insert the card incorrectly or to build the technology such that it could be read in any way it is inserted.

The rest of the card has numerals printed in MICR and words printed in a derived-from-MICR font like Data70. (MICR proper just has numerals.) MICR was designed such that the blobs on the letterforms, printed in magnetic ink, would be more easily detectible by a magnetic reader. It was seen as “computery” in the 1970s and 1980s (maybe still to some degree today) but does not make a lot of sense here when that part of the card is not available to the reader.


Also on the key is his name, R. DECKARD. This might be useful to return the key to its rightful owner, but like the elevator passphrase, it needlessly shares personally identifiable information of its owner. A thief who found this key could do some social hacking with the name and gain access to his apartment. There is another possible solution for getting the key back to him if lost, discussed below.

The numbers underneath his name are hard to read, but a close read of the still frame and correlation across various prop recreations seem to agree it reads

015 91077
VP45 66-4020

While most of this looks like nonsense, the five-digit number in the upper right is obviously a ZIP code, which resolves to Arcadia, California, which is a city in Los Angeles county, where Blade Runner is meant to take place.

Though a ZIP code describes quite a large area, between this and the surname, it’s providing a potential identity thief too much.

Return if found?

There are also some Japanese characters and numbers on the graphic beneath his thumb. It’s impossible to read in the screen grab.

If I was consulting on this, I’d recommend—after removing the ZIP code—that this be how to return they key if it is found, so that it could be forwarded, by the company, to the owner. All the company would have to do is cross-reference the GUID on the key to the owner. It would be a nice nod to the larger world.

(Repeated for easy reference.)

The holes

You can see there are also holes punched in the card. (re: the light dots in the shadow in the above still.) They must not be used in this interaction because his thumb is covering so much of them. They might provide an additional layer of data, like the early mechanical key card systems. This doesn’t satisfy either of the other aspects of multifactor authentication, though, since it’s still part of the same physical token.

This…this is altered.

I like to think this is evidence that this card works something like a Multipass from The Fifth Element, providing identity for a wide variety of services which may have different types of readers. We just don’t see it in the film.


Which brings us, as so many things do in sci-fi interfaces, back to multi-factor authentication. The door would be more secure if it required two of the three factors. (Thank you Seth Rosenblatt and Jason Cipriani for this well-worded rule-of-thumb)

  • Knowledge (something the user and only the user knows)
  • Possession (something the user and only the user has)
  • Inherence (something the user and only the user is)

The key counts as a possession factor. Given the scene just before in the elevator, the second factor could be another voiceprint for inherence. It might be funny to have him say the same phrase I suggested in that post, “Have you considered life in the offworld colonies?” with more contempt or even embarrassment that he has to say something that demeaning in front of Rachel.

Now, I’d guess most people in the audience secure their own homes simply with a key. More security is available to anyone with the money, but economics and the added steps for daily usage prevent us from adopting more. So, adding second factor, while more secure, might read to the audience as an indicator of wealth, paranoia, or of living in a surveillance state, none of which would really fit Blade Runner or Deckard. But I would be remiss if I didn’t mention it.


Chef Gormaand

Hello, readers. Hope your Life Days went well. The blog is kicking off 2016 by continuing to take the Star Wars universe down another peg, here, at this heady time of its revival. Yes, yes, I’ll get back to The Avengers soon. But for now, someone’s in the kitchen with Malla.


After she loses 03:37 of  her life calmly eavesviewing a transaction at a local variety shop, she sets her sights on dinner. She walks to the kitchen and rifles through some translucent cards on the counter. She holds a few up to the light to read something on them, doesn’t like what she sees, and picks up another one. Finding something she likes, she inserts the card into a large flat panel display on the kitchen counter. (Don’t get too excited about this being too prescient. WP tells me models existed back in the 1950s.)

In response, a prerecorded video comes up on the screen from a cooking show, in which the quirky and four-armed Chef Gourmaand shows how to prepare the succulent “Bantha Surprise.”


And that’s it for the interaction. None of the four dials on the base of the screen are touched throughout the five minutes of the cooking show. It’s quite nice that she didn’t have to press play at all, but that’s a minor note.

The main thing to talk about is how nice the physical tokens are as a means of finding a recipe. We don’t know exactly what’s printed on them, but we can tell it’s enough for her to pick through, consider, and make a decision. This is nice for the very physical environment of the kitchen.

This sort of tangible user interface, card-as-media-command hasn’t seen a lot of play in the scifiinterfaces survey, and the only other example that comes to mind is from Aliens, when Ripley uses Carter Burke’s calling card to instantly call him AND I JUST CONNECTED ALIENS TO THE STAR WARS HOLIDAY SPECIAL.

Of course an augmented reality kitchen might have done even more for her, like…

  • Cross-referencing ingredients on hand (say it with me: slab of tender Bantha loin) with food preferences, family and general ratings, budget, recent meals to avoid repeats, health concerns, and time constraints to populate the tangible cards with choices that fit the needs of the moment, saving her from even having to consider recipes that won’t work;
  • Make the material of the cards opaque so she can read them without holding them up to a light source;
  • Augmenting the surfaces with instructional graphics (or even air around her with volumetric projections) to show her how to do things in situ rather than having to keep an eye on an arbitrary point in her kitchen;
  • Slowed down when it was clear Malla wasn’t keeping up, or automatically translated from a four-armed to a two-armed description;
  • Shown a visual representation of the whole process and the current point within it;

…but then Harvey wouldn’t have had his moment. And for your commitment to the bit, Harvey, we thank you.