If you were to hold a pen in each hand, with one held five inches from your face and the other at arm's length, the one closer to your face will look larger, even though they are the same size. This is based on cues from ______.

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Quizplus · Accepted Answer

This phenomenon is based on differences in the retinal image each eye perceives. The pen held closer to the face is projected larger on the retina, leading the brain to perceive it as larger. This is known as size constancy, where the brain is able to hold a consistent perception of an object's size despite changes in its retinal image.

If You Were to Hold a Pen in Each Hand