Ambiguity is the norm, it isn't rare. Almost all visual input, ie., light, is ambiguous. We (animals) use the history of our prior geometrical-light experiences

Ambiguity is the norm, it isn't rare. Almost all visual input, ie., light, is ambiguous. We (animals) use the history of our prior geometrical-light experiences (ie., walking around) to use environmental cues to resolve ambiguity. That billions (, trillions) of images are needed to aproximate what we can do for a single instance, i think is a good guide to the magnitude of the problem. Google the "amnes room" -- that "illusion" is how we are always seeing.