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Keywords:

  • tilt illusion;
  • orientation;
  • Zöllner illusion;
  • Fraser illusion;
  • Café Wall illusion;
  • spiral illusion

Abstract:  This article reviews the study of tilt illusions by focusing on new illusions or new demonstrations reported by Japanese researchers after the review of Oyama (1960). Steady progress was observed in a variety of illusions. In particular, the development of the study of the Café Wall illusion and its related illusions during the past decade was remarkable. The study of the spiral illusion has also progressed dramatically.