REMOVE

1. lines (geometric concept)
2. figures (representations)
3. 1939–1940
4. 1940

WHAT

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

WHERE

1. Pullman, Washington (1)

WHO

1. Still, Clyfford (1)

WHEN

1. 1939 (1)