A space and classification system created by Fay Nicolson and Oliver Smith for Open Books at the RCA, London, 2011. Perpetual Proposal initiates a system to circulate and record the flow of books within an exhibition as reading room. The books, selected by Sophie Demay and Charlotte Cheetham, all deal with the form and content of the book as a subject. Fay and Oliver's system (encompassing a diagram, trolley, display board and librarian) relates to the humanist and expanding classification systems of S.R. Ranganathan and his book The Five Laws of Library Science.