The okuma illusion: A new illusion of leaning

Takashi Yasuda*, Takashi Ueda, Kenpei Shiina

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A new illusion demonstrating the perception of tilted objects is reported. Physically, all the objects in a rotated image should tilt at the same degree. We, however, found that the tilt of objects in a rotated frame is perceived differently. We tested several objects and found that this phenomenon is especially noticeable when an element in the image has a non-geometric shape. A possible mechanism for this illusion is proposed.

Original languageEnglish
Pages (from-to)1277-1280
Number of pages4
Issue number10
Publication statusPublished - 2012


  • Rotation
  • Tilt illusion
  • Visual illusion

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Ophthalmology
  • Sensory Systems
  • Artificial Intelligence


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