Man drawing a lute

Frontispiece of the 1532 edition of Albrecht Dürer's canonical Institutionum Geometricarum. This engraving represents two men using a picture used to draw a musical instrument following geometrical perspective.
Institutionum Geometricarum was a volume on geometry which applies the mathematical theories of Ptolemy and Euclid to drawing, architecture and typography, which is part of Dürer’s theoretical legacy but also includes some of his most iconic engravings such as this one.