Puzzle solvers prize difficulty and challenge over ease. Deep, absorbing play draws them not because it is easy, but because it is precisely the opposite.
In the last two weeks, three friends, hunkering down during this pressing national health crisis, sent me pictures of vast puzzles they had recently completed.
One of them, a man who had spent a busy career teasing apart intricate legal questions, put together a thousand-piece 3D portrait of a mischievous cat.
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