I used to live near Philly’s Eastern State Penitentiary, a tourist destination that looks like a few square blocks of medieval castle plunked down into a residential neighborhood. From above, though, it looks a bit like a flower, or a windmill: It’s one of the first physical examples of a panopticon, a concept dreamed up by British philosopher Jeremy Bentham in the late eighteenth century. He imagined a circular prison built so every inch of every cell was visible from a central observation point—hence “pan-optic,” meaning “all-seeing.” A single jailer could watch over an entire prison from
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