Sophie Taeuber-Arp (1889–1943) Swiss artist
In a letter of Taeuber-Arp, 1937, to a goddaughter on the occasion of her confirmation; as quoted in Sophie Taeuber-Arp, Carolyn Lanchner; https://www.moma.org/d/c/exhibition_catalogues/W1siZiIsIjMwMDA2MjY2MCJdLFsicCIsImVuY292ZXIiLCJ3d3cubW9tYS5vcmcvY2FsZW5kYXIvZXhoaWJpdGlvbnMvMjI2MSIsImh0dHBzOi8vd3d3Lm1vbWEub3JnL2NhbGVuZGFyL2V4aGliaXRpb25zLzIyNjE%2FbG9jYWxlPWVuIiwiaSJdXQ.pdf?sha=73a64e585a97e2b9 Museum of Modern Art, 1981, p. 18 ISBN 0870705989