The Muller-Lyer and Ponzo illusions make lines that are actually equal in length appear to be unequal.This is accomplished by:
A) creating a disproportionate contrast between other nearby lines.
B) providing cues that make one of the lines appear farther away than the other.
C) tricking the eye into moving along one line more quickly than the other.
D) presenting more than one Gestalt grouping principle at the same time.

Question

Quizplus · Accepted Answer

Both Muller-Lyer and Ponzo illusions use depth cues to make one line look farther away than the other, which creates an illusion of unequal length. In the Muller-Lyer illusion, the fins at the end of the lines create an impression of corners or arrows that point inwards or outwards, suggesting that one line is closer than the other. In the Ponzo illusion, converging lines or railway tracks create an impression of depth, making the upper line appear farther away, and thus larger, than the lower line, which appears closer.

The Muller-Lyer and Ponzo Illusions Make Lines That Are Actually