Want to know something weird but nice?

Remember those old view master 3D viewers you had when you were a kid?

Try this. Take any color photograph from a magazine, such as National Gegraphic...the clearer and more sharply detailed the better. Look at it. Flat right?

Now take one hand and completely cover one eye. Wait a few seconds, and tada! It suddenly begins to look 3D!

Not as perfect as the old viewers, but strangely enough, the effect is still there.

Why it works, I have no inkling, but it does indeed work.

I learned that years ago, and just thought I would share. Pass it onto your grandkids.

Daffy, check out the dominant eye shaded glasses. These are sold and use the same principle to make movies etc look like 3D. It's something about how the brain interprets images though both eyes to get depth information. Try a google search on 3D and dominant eye for details and products.

The Pulfrich Effect is one example - watching a swinging pendulum with the lens of a pair of sunglasses over one eye will make the pendulum seem to be swinging in a circle. Simulated 3D.

This and other oddities of human perception, many of which have direct applications to magic, are covered in one of my favorite non-magic books, 'Mind Hacks'.