But surely an artist of Rembrandt's talents wouldn't need lenses or mirrors to create his masterpieces? The authors, however, demonstrate that he probably made use of them.
Evidence that the Old Masters used projections to create self portraits turns up in their work. In addition to smaller self portraits etched in copper that bear signs of projections, two of Rembrandt's early painted portraits were made on copper, "an unusual choice of surface for a painting, but perhaps telling of an artist working from a projection," the authors write.
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