Similar to the Square above but this time  just look away from the monitor and then look back again for best results !

Again scroll the screen up and down whilst looking at the green square.

And again, scroll the screen up and down whilst looking at the green square.  Its best to use the scroll bar rather than the mouse.

This one is fantastic: Only look directly at the cross, not at the spots. The pink spots will appear to turn green as they disappear. If you keep looking at the cross then all you should see is a green ball going around it.

This unbelievable checker square illusion has had me boggled for ages. Squares 'A' and 'B' are in fact exactly the same shade of gray. The same picture is again produced next to it with a connecting square to prove it.