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Gallery of Akiyoshi Kitaoka illusions
On the right are Aliyoshi 'lips', the images appear to collapse inwards
  
image: 'Lips'
      
             
image: Concentric Circles
      
   
Akiyoshi Kitaoka's 'Concentric cirlces' illusion (left). The circles appear to rotate in opposite directions if you move your head back and forth in front of the screen.
image: Demonstration of colour assimilation

Also See:

Colour illusions
The eye
Colour TV

      
Demonstration of colour assimilation (right), red appears to be magenta or orange.