This short film is intended to encourage reflection on the history of the Israeli-Palestinian conflict by evoking the performance The Green Line, created in 2004 by artist Francis Alÿs. Marking the Boundary is based on unedited rushes from the film Room of Shadows. The aim of Room of Shadows is to highlight works of art, films and books that discuss the role of images (and representations in general) as vectors of ideologies, or as tools for emancipation.