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Gallery of Akiyoshi Kitaoka illusions
The oblique lines in this image (right) are straight but appear to be curved.
  
image: Oblique lines
  
'U-zu-maki' by Akiyoshi Kitaoka (below), showing strong illusory motion in the spirals. WARNING - this image can induce nausea.
  
           
image: Blue circles
      
image: U-zu-maki
    
   

Also See:

Colour illusions
The eye
Colour TV

      
The blue circles in this image (left) appear to have increased saturation when viewed in central vision.