Pilař made the two surviving reels of animation experiments after his return from the 1963 Paris Biennale. The gestural brush painting over the surface of the originally black and white puppet film which he almost completely removed from the stock falls at the beginning of his programme works of expressive collage and assemblage. He returned to it repeatedly, as he did to the material he later reworked for Pink Floyd (ca. 1984) and Colours 1965 (ca. 1991).