The similarity between motion picture cameras and projectors is such that if a projection booth is adequately darkened and unexposed film is run through a projector, light illuminating the theater will enter the projector lens and expose the film. 35mm film projectors used this way will record the objects and space before them, exposing the relationship between two fixed elements in the cinema: the projector and the screen. In "Projector Obscura", the lens, which is normally responsible for casting out so many images, is given a chance to take in light and reflect upon its theatrical space, and the screen is given a chance to stand bare.The theaters recorded in this project are the Biograph, the Gene Siskel Film Center, Anthology Film Archives, Gateway, MFA-Boston, Coolidge Corner and Harvard Film Archive.