TWO
From Perceptionto Imagination
Education consists mainly in what we have unlearned.
—Mark Twain
HUMANS DEPEND ON VISION, more than any other sense to navigate through the world. Mostly we take the visual process for granted. And rightly so, for if we had to think too much about what we see from moment to moment, scarce brain power would remain for doing anything else. Most of the time, the efficiency of our visual systems works to our advantage. Hitting a major league fastball, for example, requires the precise coordination of eyes and body. A 90-mile-per-hour fastball reaches the plate in about 0.4 seconds, but the batter must decide whether to hit it when it gets about halfway. The limit of human reaction time is about 0.2 seconds, which ...
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