An optical illusion whereby a disk appears smaller if surrounded by larger disks than if by smaller.

The optical illusion whereby the moon looks larger when it is low in the sky than otherwise.

An optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad tracks than when lower.

(psychology) The illusion of proprioception that one's nose is growing longer.

An optical illusion in which parallel lines are made to appear convergent or divergent by means of oblique intersections.

An optical illusion in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape.

(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.

A cognitive bias by which people wrongly think that they have direct insight into the origins of their mental states, while treating other people's introspections as unreliable.

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.

(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."