A friend of mine sent me these and I thought they were so cool that I decided to post them. Just follow the links and the explanations are given.
Say the color, not the word (really tough)
How many legs does an elephant have? ( I stared at this for many minutes)
Moving circles (This is the coolest I have ever seen!!!)
Are the purple lines straight or bent?
Which circle in the middle is bigger?
What else besides a man's face?