REMOVE

1. rock
2. Yaddo
3. trucks
4. 1978

WHAT

1. Visual works (hierarchy n … (2)
2. abstraction (2)
3. black (2)
4. blue (2)
5. gray (2)

WHERE

1. San Francisco, California (2)

WHO

1. Still, Clyfford (2)

WHEN

1. 1947 (1)
2. 1950 (1)