cf. Ron Arad, exhibition catalogue, Barry Friedman Gallery, New York, 2005, pp. 62-63 for an example from the edition of 20 executed in patinated steel;
E. Hall, ed., Ron Arad: No Discipline, exhibition catalogue, The Museum of Modern Art, New York, 2009, pp. 104-105 for related forms in fabric and polyethelene manufactured by Moroso.