Not to mention object recognition. If I see something that resembles a car, I know roughly what size I expect a car to be so based on the size it appears, I can

Not to mention object recognition. If I see something that resembles a car, I know roughly what size I expect a car to be so based on the size it appears, I can reasonably estimate its distance from me. Of course this breaks down when objects don't meet our expectation in terms of size and can be the source of some interesting optical illusions.