I found some "stereographs" online that allow you to fool your brain into seeing 3-D images from 2 flat 2-D images. Here's an example: It's just 2 side by side identical images with Blue, Red, and Yellow dots, right? Not quite... but you have to fool your eyes into not focusing on the plane of the screen to "see" that, because your brain is constantly busy trying to make sense of the world around us. To see the 3-D image, you have to focus your eyes beyond the screen. You'll get double vision when you do that, which your brain will hate, but try to relax and not focus back on the screen. At first you'll see 4 red dots. Keep going until the middle two Red dots (of the 4) merge into one... and then magic happens. You'll know when you've got it because you'll suddenly see the dots coming out of the screen at you with the Blue dot is behind the Red one, and the Yellow dot in front. The dots and the words will no longer be fuzzy but will be clear as well. Remember you brain is desperately uncomfortable when it cannot make sense of what it is seeing, so it "likes" making sense of it by perceiving it as a 3-D thing. You'll actually see 3 images, and only the middle one has any depth -- the ones on the far right and left are flat (and behind the middle image). Cool, eh? Well, then try a more interesting one. This one is a 3-D picture of our stellar neighborhood -- that is, our sun and its several nearest stars: This one is harder. If you have trouble, try backing away a bit or reducing the zoom. You should see that alpha Centari and Barnard's star (or 2 nearest star systems) are behind the sun, while Sirius and Procyon are in front of it. Cool, huh? These were taking from an interesting astronomy site, called "Harry's Comparative Astronomy".