The Arts Council of Great Britain asked Hamilton to organize a Duchamp retrospective at the Tate Gallery in 1966. The Almost Complete Works of Marcel Duchamp opened on 18 June 1966. Realizing the futility of trying to do justice to Duchamp without the 'Large Glass' and other glass studies (the 1915-23 original, in Philadelphia, was too delicate to travel), Hamilton spent a year making a reconstruction of Duchamp's masterpiece, working from the notes and dimensions given in the 'Green Box'. Lullin, p. 254 In the end, Duchamp recognized Hamilton's involvement, saw them as new works, and insisted this and the other related works should be signed by both of them.