The kids have an interesting book that when you look at the pictures in a certain way you can see a 3D image in them... fascinating but I end up with a head-ache. This is the site about the books http://www.magiceye.com/enter.html
Knowledge is knowing a tomato is a fruit, wisdom is knowing not to use it in a fruit salad.
A ounce of common sense is worth more than a ton of intelligence.
I can never do these things. I try and try and also with the books but the image never appears for me as hard as I ocncentrate and whether I have my glasses on or off. Just something that my brain cannot do.
"The air of heaven is that which blows between a horse's ears."