Rule of Thumb

ESTIMATING DISTANCES

Hold your thumb at arm’s length against a distant background. Estimate how far your thumb jumps on the background when ...

Hold your thumb at arm’s length against a distant background. Estimate how far your thumb jumps on the background when you look at it with one eye and then the other. The background is ten times that distance from you. — Norman Brenner, Fleetwood, New York

11/29/14

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