Columbia subject headings:
Crystals.
Klee, Paul, 1879-1940--Criticism and interpretation.
Taut, Bruno, 1880-1938--Criticism and interpretation.
Harvard subject headings:
Crystals--Influence.
Klee, Paul, 1879-1940.
Taut, Bruno, 1880-1938.
Princeton subject headings:
Crystals in art.
Klee, Paul, 1879-1940.
Taut, Bruno, 1880-1938.