i reckon theres magnets under the white platform
Im not sure whether robots could move so close together like that?
Magnets are an interesting idea, especially because there is no real sense of scale - though magnets would demand the box be of some size in order to keep it pointed in the right direction and not spinning around randomly as the magnet moves. Though maybe a magnet on one side would let the rest of the box drag, but it doesn't always feel like that when watching it play.
Looking at the way the thing moves, I assumed it was some sort of simple, wheeled, remote controlled robot under the box. There is a loose jerkiness to the movement that makes it feel like it isn't stuck to the platform, or necessarily stuck box-to-chassis very well.
There is only one robot/moving-thing, the other boxes never move under their own power.
Due to the title, my impression is that the robot is secondary to the test. Some sort of tracking is going on, the lines on the side are following (or guiding?) the motion of the orange box. I was thinking that this was some sort of "can a computer program make aesthetic decisions" test, in real space.