|My textbook came with red-green glasses, which is awesome.|
It was more expensive than seeing Avatar, though.
|And people still think a PhD in Psychology is impractical.|
So how does viewing that picture with 3D glasses make your brain think there's a hole in your monitor? And why doesn't it work if you have lazy eye?
Fact #1: Unless you have lazy eye, by virtue of having two eyes, your brain always gets two very slightly different pictures of whatever it is you're looking at. One from your left eye, and one from your right eye. If you do have lazy eye, your brain ignores one of these pictures in favour of the other one.
Fact #2: There is a systematic relationship between the differences in the two pictures and how far (in depth) something is from the thing you're looking at.
Here's what's really cool - the brain can exploit these relationships at high speeds to give us this extremely vivid perception of depth. Usually, we don't think photos are 'missing' anything, but the difference between a perceived depth and a projection of a 3D scene on to a flat surface is really amazing once you see a 3D photo.
There are a ton of beautiful stereo-photos of old japan, taken by Japanese photographer Enami, collected on Flickr by Okinawa Soba.
|From Okinawa Soba's set|