Private collection (acquired from the artist).
Acquired from the above by the present owner, April 1966.
E. Trier, Jean Arp Sculpture, His Last Ten Years, New York, 1968, p. 111, no. 208 (another cast illustrated, pl. 40).
J. Russell, "Jean Arp--A Pioneer Worthy of Honor," The New York Times, 10 August 1986 (another cast illustrated).