Portraiture and Arithmetic in Sixteenth-Century Bavaria: Deciphering Barthel Beham’s Calculator *
In his portrait of an unidentified man (Vienna, 1529), Barthel Beham portrays the sitter paused in the midst of a math problem. As has been discovered, the numbers and symbols belong to the vocabulary of numerical calculation. This finding first raises the question of why a patron would want to be shown doing computation with Arabic numerals in a portrait. In 1529, numerical calculation was a commercial tool, not a field with humanistic/social cachet such as geometry. Further, the depicted computation does not make sense: the symbols and numbers are arranged in the form of a problem without actually being one. Yet the patron either did not notice or care. This article argues that the incomplete computation is not only a reflection of the contemporary status of mathematics using Arabic numbers, but also provides a way of understanding how the painting functioned as a portrait in the social milieu of the sixteenth-century Munich court.