When you walk around, your vision system is processing a whole bunch of signals in milliseconds and judging that a visual object is a wall, or an imminent cliff, or a car heading towards you. This might be disturbing to a lot of people, but some of those guesses are errors.
Usama FayyadHuman beings, from a mathematical perspective, are fairly limited. Two and three dimensions, maybe five, and we're OK.
Usama Fayyad