"Film should not be misused for non-filmic messages": Wilhelm and Birgit Hein examine in their films theprocess of reproduction and the film material itself. Rohfilm shows the destruction of the common "film image" and was described by Stephen Dwoskin as a "visual bombing" of shreds, fragments, dirt and leftovers of film editing. Reproductions dissolves photos in greys, 625 films a negative "snow" TV image with different speeds, in Portraits photos are changed by the development and reproduction processes. Materialfilme consists of film starting and ending leaders, the elements of every film that normally are not seen on the screen. W+B Hein's underground film classics deal with the unexplored potentials of the film material which starts to disappear in the digital world.