[aylons]

What I mean is that binocular vision just give us depth perception for a meter or so - about around where our hands can touch.

Moving the head/body goes a little further, but that was not my point.

[venusenvy47]

Is this true? I'm looking at a tree outside and I get parallax when I close one eye and then the other. I thought the parallax is the basis for depth perception.