The budding mathematician and physicist Carl Friedrich Gauss (1777-1855), who had already been hailed as a child prodigy during his lifetime, was also not inept at drawing. The full-figure profile portrait of his teacher Abraham Gotthelf Kästner (1719-1800), which he made with a compass and a ruler, is ambitious, even if the perspective representation of the table is unsuccessful and he needed to carry out a preliminary study for the facial line at the margin. The joke, however, lies in the simple addition on the blackboard, where the answer is simply incorrect: The teacher disqualifies himself on a content level, the student-caricaturist rises above him.
