Columbia subject headings:
Art, Modern--20th century--Themes, motives.
Avant-garde (Aesthetics)--Themes, motives.
Harvard subject headings:
Art, Modern--20th century--Themes, motives
Avant-garde (Aesthetics)--History--20th century--Themes, motives.
Princeton subject headings:
Art, Modern--20th century--Themes, motives.
Avant-garde (Aesthetics)--History--20th century--Themes, motives.