REMOVE

1. water
2. rock
3. machinery
4. black-and-white film

WHAT

1. farms (1)
2. graphite pencils (1)
3. landscapes (representatio … (1)
4. notes (1)
5. studies (1)
6. Visual Works (hierarchy n … (1)
7. wax crayons (1)

Less

WHO

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

WHEN

1. 1923 (1)
2. 1936 (1)
3. circa 1931 (1)