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World 5 · Impossible Objects and Ambiguous Pictures · 10 min · PRO

The Penrose triangle

An impossible object you can build

PRO · Illusion Lab

World 5: Impossible Objects and Ambiguous Pictures is part of PRO

The first world of Illusion Lab is free. PRO opens the other 24 lessons in 6 worlds — simulations, quizzes and all.

  • Gestalt: the whole before the parts
  • Figure and ground: Rubin and Necker
  • Illusory contours
  • How fast are you?
  • Apparent motion and the waterfall effect
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

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← Figure and ground: Rubin and NeckerIllusory contours →

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