REMOVE

1. plows (agricultural equipmen …
2. rock

WHAT

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

WHO

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

WHEN

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