871eca60-d5f6-11e3-ae51-a1fb54380bd9_Roger-N-Shepard-Glee-Turns-Glum

“Glee Turns Glum” drawn by Roger N. Shepard. (© R. N. Shepard. Published in Shepard, R.N. Mind Sights: Original Visual Illusions, Ambiguities, and Other Anomalies. (1990). New York: WH Freeman and Company.)

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