(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."

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.

An optical illusion consisting of a stylized arrow whose midpoint appears to be closer to the tail end.

(psychology) The psychological illusion by which people tend to believe that their personalities and preferences have reached a more or less stable state, despite recognising that these things have undergone significant change in the past.

plural of argument from illusion

(philosophy) An argument for the existence of sense-data, and thus a criticism of direct realism, according to which what we perceive (such as a stick that looks bent because it is viewed underwater) is distinct from the actual thing perceived (the straight stick).

Synonym of flash-lag effect

A tactile illusion where tapping separate regions of a person's skin in rapid succession (e.g. the elbow and the forearm) gives the impression of sequential taps "hopping" from one point to the next, even though the intermediate points were never touched.

An optical illusion in which the parallel straight dividing lines between staggered rows with alternating dark and light "bricks" appear to be sloped rather than parallel.

An optical illusion where, when a diagonally striped pole is rotated around its vertical axis (horizontally), it appears as though the stripes are moving in the direction of its vertical axis (downwards in the case of the animation to the right) rather than around it.