I’m pretty sure it was 1971, but it could have been 1972. In any case, it was in kindergarten, and I was five years old. Our teachers had set up a system to motivate us kids to behave well. They had hung a big board on the wall, with all of our names listed. If you were particularly well-behaved, kind, helpful, or polite, they drew a black dot next to your name. Misbehave, and they gave you a red one. It was all about following the kindergarten rules, and the absolute transparency of it motivated most of us to try our best.

At some point, an extra prize was introduced for exceptionally good behavior: a small piece of fabric. From the group’s standpoint, that was worth much more…

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