lilac chaser

English

Noun

lilac chaser (plural lilac chasers)

  1. An optical illusion involving 12 pink blurred discs arranged in a circle around a small black, central cross on a grey background. The brief disappearance of each disc in turn causes the observer to see a gap running around the circle of pink discs; a green disc running around the circle of pink discs in place of the gap; or the green disc running around on the grey background, with the pink discs having disappeared in sequence.
    Synonym: Pac-Man illusion
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