Imagine walking into an office and not liking the way it is arranged. So you move one chair to the left. You put a few books on the credenza. You get a hammer and rehang a painting. All this may take an hour at most, since the task is relatively straightforward. Indeed, creating change in any system of independent parts is usually not difficult. Now imagine going into another office where a series of ropes, big rubber bands, and steel cables connect the objects to one another. First, you’d have trouble even walking into the room without getting tangled up. After making your way slowly over to
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