A collection of 604 Optical Illusions collected from various sources.
Some old stuff, some stuff I have not seen before; all good! Check out: Optical Illusion
Three examples:
Which ball is on what shelf.
Say aloud the color of each word.
And finally, this classic:
I used to work for a large Engineering company and this last one drove them nuts.
I didn't tell them the solution to the missing square and finally, one of them got it.