It is the subject of the second episode of the well-written, haunting new art historical series, “Civilizations,” now airing on PBS; the new Amy Schumer film “I Feel Pretty”; the May-June issue of The Gay & Lesbian Review; Heather Widdows’ forthcoming book “Perfect Me”; and a current show at The Met Breuer.

We’re talking, of course, about the body – the filter through which, “Civilizations” says, we see everything – including the body itself. …

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