The effect from viewing a pendulum swing with one eye in a normal state and the other utilizing a dimming filter. The difference in timing makes the pendulum appear to be moving in an elliptical pattern rather than back and forth.

PULFRICH EFFECT: "The Pullfrich effect can be used to give the illusion of three dimensional depth to a two dimensional image."
Cite this page: N., Pam M.S., "PULFRICH EFFECT," in PsychologyDictionary.org, April 28, 2013, https://psychologydictionary.org/pulfrich-effect/ (accessed January 18, 2021).