An optical illusion in which a white area takes on a pale tint of a thin, bright, intensely colored polygon surrounding it if the coloured polygon is itself surrounded by a thin, darker border.

plural of watercolor illusion

An optical illusion where an edge between regions of the same shade causes them to be perceived as different shades.

plural of Cornsweet illusion

(economics) The cognitive bias that leads people to think of money in nominal rather than real terms, mistaking its face value for its purchasing power at some point in time.

(linguistics) A kind of comparative sentence that superficially seems acceptable but actually has no clear meaning. Example: "More people have been to Russia than I have."

plural of comparative illusion

An optical illusion involving the misperception of the position of one segment of a transverse line that has been interrupted by the contour of an intervening structure.

(aviation) An illusory perception of one's pitch angle, due to the effects of linear acceleration on the vestibular system of the inner ear.

plural of somatogravic illusion