Not long ago, my six-year-old son was in the bath, building cities out of colorful foam blocks. (“City blocks!” he said. “Get it?”) One metropolis, on the tub’s outside edge, was supposed to be based in the present day; another, closer to the wall, was a future city. A third was constructed on a purple rectangle that floated in the water. “What’s that one, on the purple island?” I asked.
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