This is without a doubt one of the coolest PC illusions I have seen so far. Follow the instructions:
1) Relax and concentrate of the 4 small dots in the middle of the picture for about 30-40 seconds.
2) Then, take a look at a wall near you (any smooth, single colored surface)
3) You will see a circleof light developing
4) Start blinking your eyes a couple of times, and you will see a figure emerging...
5) What do you see? Moreover, who do you see?