REMOVE

1. lines (geometric concept)
2. machinery
3. Pullman, Washington
4. 1939

WHAT

1. Visual works (hierarchy n … (1)
2. blue (color) (1)
3. figures (representations) (1)
4. gears (1)

WHO

1. Still, Clyfford (1)

WHEN

1. 1939–1940 (1)
2. 1940 (1)