Allegory of Sleep; ca. 1570; Pen and brown ink; brush and brown wash; over traces of red chalk; Diameter: 3-11/16 in. (9.4 cm); Drawings; Giorgio Vasari (Italian; Arezzo 1511-1574 Florence); The two rapid sketches with the Allegory of Forgetfulness and the Allegory of Sleep were executed in pen and brown ink by the Renaissance artist and historian Giorgio Vasari in a quick and spontaneous manner to record his ideas for a ceiling or wall decoration