Lately, I have been addicted to stereograms. Anyone has heard of it before? Well it's basically a picture with lots of random pattern in it. But if you look it at a certain way, a 3-D image will pop out. It's really amazing how our eyes work. It took me hours to be 'enlightened' and gain the ability to see the hidden 3D image though.
One example:
http://www.vision3d.com/sghidden/shark.html
if viewed correctly, the image in the link above will display a 3D shark.
Now before you accuse me of losing my mind or trying to waste your time, I am NOT. It is for real
Here's a tutorial from youtube how to see stereograms:
http://www.youtube.com/watch?v=kgrUfUI0Y9g&feature=related
I believe different people learn to view stereograms differently. The way I see it is, while looking at the image, I looked down on my nose but not letting the image escape my vision. Then after focusing on my nose, I will slowly look back at the image, and voila! The 3D image appears (most of the time).
Good luck for first-timers!
One example:
http://www.vision3d.com/sghidden/shark.html
if viewed correctly, the image in the link above will display a 3D shark.
Now before you accuse me of losing my mind or trying to waste your time, I am NOT. It is for real

Here's a tutorial from youtube how to see stereograms:
http://www.youtube.com/watch?v=kgrUfUI0Y9g&feature=related
I believe different people learn to view stereograms differently. The way I see it is, while looking at the image, I looked down on my nose but not letting the image escape my vision. Then after focusing on my nose, I will slowly look back at the image, and voila! The 3D image appears (most of the time).
Good luck for first-timers!