Any child can tell you that it matters enormously who gets to press the buttons in an elevator. If you’re not the designated button-pusher, you may have to watch a sibling flaunt the privilege. If you’re the anointed one, you may guard your status into adolescence. So when children open Minh Lê and Dan Santat’s perceptive picture book “Lift” (Little, Brown, 48 pages, $17.99), they know the score.

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