The Sequin Illusion

Yi Tsen Kuo, Philip Tseng

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The Sequin Illusion can be seen when shapes are drawn in dotted lines, against a background of different brightness. This can be done either with bright dots over a dark background or with dark dots over a bright background, though the latter usually works better. The illusion appears as a wave of dark (or bright) spots inside the dotted shapes (like sequins!) in peripheral vision. Although similar in appearance with the Hermann Grid, the Sequin Illusion occurs inside the shapes; persists despite slanted, disrupted, or nonrectangular edges; and is only eliminated when the dotted contour is formed by colors of similar brightness. Therefore, this illusion is driven by brightness (not color) contrasts in contours, which possibly points to the magnocellular channel in lateral geniculate nucleus.

Original languageEnglish
Issue number6
Publication statusPublished - Dec 14 2019


  • brightness contrast
  • Hermann Grid
  • luminance contrast
  • perception
  • perceptual fill-in

ASJC Scopus subject areas

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


Dive into the research topics of 'The Sequin Illusion'. Together they form a unique fingerprint.

Cite this