Bowls like this one were used to catch the blood released by bleeding. The appearance of blood was a useful diagnostic tool for physicians, who examined it for clues about the body's internal state. This large bowl was capable of holding a great deal of blood, but its maker encouraged moderation by stamping "BLEED ME LIGHT" in the basin.
Science History Institute. Bleeding Bowl. Photograph, 2017. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/hq37vp25j.
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