The combination of super 8, which is analogue and video which is a different kind of analogue, in visual mixing can be done in several ways. Dierck choses in this set up for the feedback style. Super 8 projected right on top of the video-beam projected surface. A video camera captures exactly that same square and outputs this to the beam(er). The video in itself feedbacks and gives the "Droste" effect. The super 8 on top of that is being picked up by the camera and is made in a new captured image which is being feedbacked. Film feedbacking visuals.