Weird idea, while drifting off to sleep:
A Lexicon of Lost Hollywood. Each entry is a movie review of a movie that was never made; each movie review must refer forward and back to other movies. You can make up actors and directors and screenwriters if you like, but they cannot be entries: they will always be defined only by the reviews of their movies. Or, if you wish, you can use the stars that we know.
The slots are not alphabetical: they are chronological. 1940-1945; 1945-1950; 1950-1955; 1955-1960; 1960-1965; 1965-1970; 1970-1975; 1975-1980; 1980-1985; 1985-1990; 1990-1995; 1995-2000. 12 slots. The secret history of Hollywood (and Bollywood, and the BBC, and Hong Kong) is revealed slowly as the needle of time moves forward.