on reverse of triangular piece at upper right side: Tony C / Jane W / Mark / Bill N. / Carlos / M / 78 [M 78 = March 1978]
Commissioned January 1978 by NGA; created in situ in the NGA East Building and completed 24 March 1978.
- Blume, Dieter. Anthony Caro. Catalogue Raisonné Vol. III: Steel Sculptures 1960-1980. Cologne, 1981: 163, 243, no. 1167, repros.
- Sculpture: An Illustrated Catalogue. National Gallery of Art, Washington, 1994: 42, repro.
- Harris, Neil. Capital Culture: J. Carter Brown, the National Gallery of Art, and the Reinvention of the Museum Experience. Chicago and London, 2013: 154, 259.