REMOVE

1. rock
2. farms
3. horizon line
4. 1940

WHAT

1. black-and-white film (1)
2. fences (1)
3. fields (land) (1)
4. landscapes (representatio … (1)
5. machinery (1)
6. plows (agricultural equip … (1)
7. shadows (1)
8. silhouettes (1)
9. sky (1)
10. Visual Works (hierarchy n … (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Still, Clyfford (1)

WHEN

1. 1920 (1)
2. between 1920 - 1940 (1)