The post at the ICA also afforded Hamilton the time to further his research on Duchamp, which resulted in the 1960 publication of a typographic version of Duchamp's "Green Box", which comprised Duchamp's original notes for the design and construction of his famous work "The Bride Stripped Bare by Her Bachelors, Even", also known as "The Large Glass". Hamilton's 1955 exhibition of paintings at the Hanover Gallery were all in some form a homage to Duchamp. In the same year Hamilton organized the exhibition "Man Machine Motion" at the Hatton Gallery in the Fine Art Department at Newcastle University. Designed to look more like an advertising display than a conventional art exhibition the show prefigured Hamilton's contribution to the "This Is Tomorrow" exhibition in London, at the Whitechapel Gallery the following year. "Just what is it that makes today's homes so different, so appealing?" was created in 1956 for the catalogue of "This Is Tomorrow", where it was reproduced in black and white and also used in posters for the exhibit. The collage depicts a muscle-man provocatively holding a Tootsie Pop and a woman with large, bare breasts wearing a lampshade hat, surrounded by emblems of 1950s affluence from a vacuum cleaner to a large canned ham. "Just what is it that makes today's homes so different, so appealing?" is widely acknowledged as one of the first pieces of Pop Art. Hamilton's written definition of what "pop" is laid the ground for the whole international movement. Hamilton's definition of Pop Art from a letter to Alison and Peter Smithson dated 16 January 1957 was: "Pop Art is: popular, transient, expendable, low-cost, mass-produced, young, witty, sexy, gimmicky, glamorous, and Big Business", stressing its everyday, commonplace values. He thus created collages incorporating advertisements from mass-circulation newspapers and magazines.