Theoretical Video (1998 – 1999) is an installation comprising a long sequence of photographs mounted in a horizontal band along the wall, presented as if they are the individual frames of a video film. The images are selected from video footage Marshall shot in Chicago's South Side from the window of his home.

They create a fragmented, experimental narrative focusing predominantly on Chicago's annual Bud Billiken Parade, including, in large part, the scene of beauty queens in parade, along with marching bands and clowns, bringing a surreal, carnivalesque, feeling to an otherwise underprivileged neighbourhood.