Sensitivity to Color, and Color Blindness

• On the figure below, fix your eyes on the white dot in the center of the green and yellow flag for a full 45 seconds – do not let your eyes wander! Then stare at the black dot on the right. What do you see?
  
  
  
  
  
  

• An interesting discussion of color blindness can be found here.
  

• By looking through these optical illusions, you will realize how much processing of raw data from the optical nerve our brains must do in order to turn order into chaos, and to make sense of the visual world around us.