Can you identify this face?
It’s a well-known President who freed the slaves and was shot in Ford’s theatre. Still stumped? Try viewing it at arm’s length, or squinting, or jiggling the page rapidly. This picture represents a Bell Labs experiment to learn the least amount of visual information a picture can contain and still be recognizable—of some concern to designers of Picture-phones. Here a computer has riven a portrait into 200 squares in 1971, each rendered in an even tone of gray along an intensity scale from one to sixteen.
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