A visual illusion that causes a vertical distance to appear greater than an equal horizontal distance, usually illustrated with an inverted T whose horizontal and vertical lines are of equal length (see illustration), first reported in 1858 by the German psychologist Wilhelm (Max) Wundt (1832–1920). See also teacup illusion, top hat illusion.
Horizontal-vertical illusion. The horizontal and vertical lines are the same length.
Subjects: Media Studies — Psychology.