cf. Le Corbusier's travel sketchbooks, Archives Foundation Le Corbusier, Paris, relevant sketch dated 7 March, 1961.
The present piece is thought to be the only version of this relief executed Le Corbusier. A few casts were made in various sizes by Giani Rattan Singh, who constructed the mold for the relief, as gifts for family and friends. The present relief was probably cast as a test piece, which was reworked by Le Corbusier own hand with a sharp objects to enhance the plaster molding.
Giani Rattan Singh worked for Le Corbusier and Pierre Jeanneret as a model maker in Chandigarh. He was responsible for the execution of the wooden molds for the symbols impressed into the concrete walls of several buildings, amongst them the Assembly and the Secretariat.