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Cafe Wall
Kanizsa Triangle drawn by Hans Kuiper
Inside Outside drawn by Hans Kuiper
Zöllner's Illusion
Hermann's Illusion
Van Ebbinghaus-Titchener Illusion
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Squares?
Frazier's Illusion: Spiral or Circles
Hering's Illusion: Straight Lines drawn by Hans Kuiper
Poggendorff's Illusion
Non Existing Circles
Reginald H. Neal's Illusion redrawn by Hans Kuiper
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Impossible Triangles drawn by Hans Kuiper
White Grid
Three in One drawn by Hans Kuiper
Müller-Lyer Illusion
Ponzo's Illusion
Cornsweet _ Craik _ O'Brien Illusion
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