But then how come things in the distance look smaller? Perspective is something that happens in your eye, not out in the world! In the real street things in the distance are not actually smaller, all the houses are exactly the same size. It is only on your retina that the farther ones appear smaller. And the image on your retina is only a flat 2-D image. This world out here is 3-D, but it has perspective. So is it is the world itself? Or is it the image on the retina?

Well, its both. Light from the world makes a picture in your eye, that lets you see the things out in the world. What's so hard about that?

© 2003 Steven Lehar, Manchester, MA USA. All rights reserved.