the most widely recognized instance of a movement aftereffect, generated by observing a waterfall for a time and then switching one's stare to still items in the environment. These items will seem to move upward or in the converse direction of the motion of the waterfall.

WATERFALL ILLUSION: "Allison experienced the waterfall illusion after spending the morning at a swimming hole with a waterfall. "
Cite this page: N., Pam M.S., "WATERFALL ILLUSION," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/waterfall-illusion/ (accessed October 24, 2020).