In order to conduct its subversions, the Resistance has a set of secret pneumatic chutes throughout SoGo. To monitor them, they have a map of the city with the chutes drawn as lines and places within the city illuminated with small lights.
The purpose of the lights is a bit vague, since just before Barbarella leaves Resistance Headquarters, Dildano glances at the map to see a red dot flashing at the very top. Gesturing at the light he remarks, “The time is right. The Queen is in her Chamber of Dreams.” But we know from the end of the film that the Queen’s Dream Chamber is on the lowest level of the city, close to Mathmos. (It would seem the Resistance has some severe information gathering issues.) So is each location able to change color to represent prominent individuals? What if two prominent people are in the same place? How does Dildano indicate which prominent person he wishes to track? We never see these controls, and per the axiom of providing inputs near outputs, we would want them to be somewhere around here.
We do get to see one interface in action, though. The chutes themselves are controlled by a set of rather rickety knife switches with large handles. A Resistance member throws one of the switches to initiate suction in a particular tube. (Fans of Futurama should note some similarities to the public transportation system in New New York.)
One the switch is thrown, a traveler extends his or her arms upwards, and then the tube handles the rest. The exits is ungraceful, tumbling travelers onto the floor in conspicuous places somewhere in SoGo.