Albrecht Dürer the Younger (1471-1528) was a German painter, graphic artist, mathematician, and art theorist of European significance. He was a prominent artist during the time of Humanism and the Reformation. The art historian Robert David Bruck presents in this sketchbook of Albrecht Dürer approximately 156 illustrations of hand drawings by the painting genius from the Brühl collection. Primarily, these are little-published sheets on the theory of proportions. Reprint of the original edition from 1905.