Humans have more than just stereo vision sensors. Like GP said, we also have robust schemata, seeded by biology and improved over our entire lives, that allow u

Humans have more than just stereo vision sensors. Like GP said, we also have robust schemata, seeded by biology and improved over our entire lives, that allow us to make sense of the things we see. These heuristics are trivial for us to access, but relatively difficult to describe and implement in a software system. That's what "common sense" means in this context.