Another stimulus [for developing the Instant City (IC) design] was the invitation to design the 'event-structure' for the 1972 Kassel Documenta - an elaborate art/event/theatre scene requiring a high level of servicing but a minimum of interference with the 'open-air creative act'. the 'Kassel-Kit' of apparatus can therefore be considered as a direct extension of the original IC Kit.

Peter Cook
Archigram, Edited by Peter Cook, Warren Chalk, Dennis Crompton, David Greene, Ron Herron & Mike Webb, 1972 [reprinted New York: Princeton Architectural Press, 1999].