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That is very cool!! I have never seen anything like that.. it almost looks like Liquid crystal display they are walking on. Does the surface react to the pressure of feet or hands...? Did you try it yourself, or was there a weight limit that would prevent me or you Sheepy, from trying it out also?
I also wonder if part of the set up is a motion detector of some kind?
I suspect that there are quite a few ways it could be done, but probably the simplest is to use a passive camera (the sensor) to observe the result of the projection and where there's a difference between what it expects to see and what it actually sees, above a certain threshold, it assumes that a person is there.You may need to calibrate the system first, perhaps by projecting some calibration images onto the ground when it is clear and noting what the camera sees, but once this has been done you can then project different images and animations and know what you should expect see.The system would need to be smart enough to cope with the changing ambient lighting conditions but that's no real show stopper.