Optical Illusions

How many black dots can you see ?........ Are you sure ?

Are the horizontal lines straight or curved ?

They are straight..........move them up against the top of the screen and check !

Do you see the spiral ?

No spiral....just concentric circles..........

What about the Indian.....or is it an Eskimo at a door?

Jazz musician or girl's face ?

You could make this up on cardboard for a portable puzzle..........