There have been instances of novelists who have worked from their own screenplays to create novels at nearly the same time as a film. Both Arthur C. Clarke, with "", and Graham Greene, with "The Third Man", have worked from their own film ideas to a novel form (although the novel version of "The Third Man" was written more to aid in the development of the screenplay than for the purposes of being released as a novel). Both John Sayles and Ingmar Bergman write their film ideas as novels before they begin producing them as films, although neither director has allowed these prose treatments to be published.