Sophie Taeuber-Arp and Hans Arp: Symétrie pathétique, embroidery on cotton, 760×650 mm, 1916–7 (Paris, Pompidou, Musée National d’Art Moderne); © 2007 Artists Rights Society (ARS), New York/VG Bild-Kunst, Bonn, photo credit: CNAC/MNAM/Dist Réunion des Musées Nationaux/Art Resource, NY