Feel free to save the pictures then print them off. The Brain is easily fooled and this proves it.
One of my all time favourite optical illusions. Stare at the dot in the middle of the picture then move you face closer to the screen. It's impossible! But it does!
Again look at the middle of the spiral picture. Then look again closely, follow the lines around!
This one is really weird. Can you see it moving?
Can you see the Lion?
What do you see?
It says stare at the red dot... Go on then!, What happens?
This is a famous picture, Are you going up or down stairs?