REMOVE

1. ink
2. trees
3. teaching
4. sketches
5. graphite pencils

WHAT

1. Visual Works (hierarchy n … (1)
2. drawing (image-making) (1)
3. lines (geometric concept) (1)

WHO

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

WHEN

1. 1933 (1)
2. 1933-1941 (1)
3. 1941 (1)