REMOVE

1. shadows
2. sky
3. neckties
4. children
5. backdrops
6. buildings (structures)

WHAT

1. Visual Works (hierarchy n … (1)
2. automobiles (1)
3. bushes (1)
4. campuses (1)

More 

WHERE

1. San Francisco, California (1)

WHO

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

WHEN

1. 1971 (1)
2. ca. 1971 (1)