top half: cropped out of Paolo Uccello - "The counterattack by Micheletto da Cotignola," (part of The Battle of San Romano triptych).
original painting at the Louvre[1] c. 1435-40?
bottom half: Paolo Uccello - "Mazzocchio" (c. 1430-1440)
Photo: Gab. fot. Soprintendenza Beni Artistici e Storici di Firenze
taken from Emmer, Michele. "Art and Mathematics: The Platonic Solids." Leonardo 15(4): 277-282 (Autumn, 1982).
/ パオロ・ウッチェロ