Clariss. Pictoris et Geometrae Alberti Dureri, de varietate figurarum et flexuris partium ac gestib. imaginum, libri duo
A 1534 Latin treatise by the painter and geometer Albrecht Dürer, on varieties of figures and the bending of body parts and gestures, issued in two books for artists and students of proportion. The pictures are woodcut-style line diagrams of heads with superimposed grids, showing construction method, rotation of the head in space, and facial proportion. A designer could take from them the idea of underlying grid systems that guide figure drawing and the way a face turns when its measurements are shifted.
