Columbia subject headings:
Art, Abstract--Exhibitions.
Art, Modern--20th century--Exhibitions.
Geometry in art--Exhibitions.
Rectangle in art--Exhibitions.
Harvard subject headings:
Art, Modern--20th century--Exhibitions
Square in art--Exhibitions.
Princeton subject headings:
Art, Abstract--Exhibitions.
Art, Modern--20th century--Exhibitions.
Geometry in art--Exhibitions.
Rectangles in art--Exhibitions.