If you've ever been captivated by an M.C. Escher drawing of stairways that lead to nowhere or a waterfall that starts and ends at the same place, then you are familiar with what psychologists describe as "impossible" objects and scenes. When do we develop the ability to perceive the difference between possible and impossible three-dimensional objects? New research in Psychological Science suggests that that infants as young as 4 months old have the ability to detect at least some three-dimensional features.
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