 A commission was suggested by Sir Norman Reid, director of the Tate Gallery, when he saw the models on a visit to Gabo's studio in the United States in 1968.Gabo sent his maquette to London and the full-size sculpture was constructed of several stainless steel plates, creating a stack of intersecting curves, deliberately unadorned and without colour.The sculpture was manufactured in 1972–73 by Stainless Metalcraft Limited of London, paid for by Alistair McAlpine, and then donated to the Tate Gallery.