Giorgio Vasari, Lives of the Most Excellent Painters… (1850)
“ Let them have wings and turn their feet backward to mark their instability, and to show how inconstant they are. Let these phantoms hover around the bed, making a species of representation or drama, by transforming themselves into things possible and impossible. Morpheus is called by Ovid the artist and inventor of figures, and therefore I would make him in the act of forming masks with all kinds of strange faces, some of which he sets on feet. ”
