Dot Matrix is a twin 16mm projection. Images overlap (ie are projected onto the same space).
Images are of photogrammed 'dots'. Sound is also the sound of the dots as they pass the optical sound head of the 16mm projectors.
Both films are 'flicker films' - ie alternate black frames with images of the dots. The two flickering images landing on the same screen generate amazing interferrence patterns.
Sound is various 'tones', emanating from two channels.
We'll hold a Q&A session after the screening.