Optical Illusions

There are many famous optical illusions around the place, here are some: 

 

9 People illusion - Opens a new window in your browser In this image it is said there are nine people, Click on it for a bigger version and see how many you can spot.

 

 

 

Squares with dots  

 

 

How many black spots can you see ?

 

 

 

Are these lines paralell?

 

 

 

Are the two brown lines curved or straight

 

 

 

 

 

Face of Christ?

 

 

 

 

 

This illusion relies on the "rods" and "cones" in the eye getting tired (follow the instructions) 

 

 

 

 

 

 

Rotating circles

 

This is a weird one, where circles appear to move, I have no idea why it works!