autostereogram

English

A random dot autostereogram encodes a 3D scene which can be "seen" with proper viewing technique.

Etymology

auto- +‎ stereogram

Noun

autostereogram (plural autostereograms)

1. A single-image stereogram, designed to trick human eyes and brains into seeing a three-dimensional scene in a two-dimensional image

   To help see a random dot autostereogram correctly, pull the eyes (and face) towards, say, within one inch of the random dot autostereogram, and then slowly pull away, until the central 3D shape coalesces into view.

Synonyms

• magic eye