His first abstract short films, Lichtspiel: Opus I (1921) and Opus II (1923), were experiments with new forms of film expression, and the influence of these early abstract films can be seen in some of the early work of Oskar Fischinger.
As súas primeiras curtametraxes abstractas, Lichtspiel: Opus I (1921) e Opus II (1923), foron experimentos das formas de expresión en cine, e a influencia deses primeiros filmes abstractos podémola atopar nos primeiros traballos de Oskar Fischinger.