There’s an old and possibly apocryphal story about how to catch a monkey that illustrates this set of ideas very well. First, you must find a large, narrow-necked jar, just barely wide enough in diameter at the top for a monkey to put its hand inside. Then you must fill the jar part way with rocks, so it is too heavy for a monkey to carry. Then you must scatter some treats, attractive to monkeys, near the jar, to attract one, and put some more inside the jar. A monkey will come along, reach into the narrow opening, and grab while the grabbing’s good. But now he won’t be able to extract his
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