The illusion makes clever use of colour theory, demonstrating how our brains perceive colours differently against certain ...

Hinnerck Schultz-Hildebrant discovered the new optical illusion "When Purple Perceived Only at Fixation" which shows purple areas display their true purple color, when directly observed but turn blue ...

Duping a guppy is easier than duping a ring dove — at least when it comes to a classic optical illusion.

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Visual illusions of motion are a major source of interest in the vision research community. Explaining how a still image can produce an illusory perception of motion is important for a more complete ...