REMOVE

1. Visual Works (hierarchy name …
2. pigs (animals)
3. ink

WHAT

1. graphite pencils (1)
2. studies (1)

WHO

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

WHEN

1. 1923 (1)
2. 1936 (1)
3. between 1923 and 1933 (1)