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The carver of the Altar of the Holy Blood, Tilman Reimenschneider, is considered to be the Michelangelo of German woodcarvers. The altar holds a scrap of tablecloth that was miraculously stained in the shape of a cross by a drop of communion wine. I really don't see how miraculous that is; I've stained many white shirts and khaki pants over the years with ketchup, wine, you name it, but no one has ever built an altar to showcase them.