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Why do people in medieval art look bored or indifferent when being killed? (cross-post from /r/Art) : AskHistorians

I've been amused by this trait in pre-1600's european paintings all my life; people going through the most horrific injuries imaginable look as if they were bored with life anyway and their killer did them a service. It would have been easier to draw open, panicked eyes and flailing arms than just laconic, Eeyore-like pawns that die on command and without fuss.