Watch 4/61: Walls Pos.-Neg. and Way (1961) : Full Movie Online Free The film uses slides - photographic planes - which show different surfaces and finishes of a wall, which have been erroded by time. Kren stacks the positives and negatives of these pictures quickly one after the other, so that a moving relief-type structure develops through this combination of "two eyes." A mysterious ambiguous image manifests itself before us, surrounded by all kinds of possible mythological connotations. What is there to see?