REMOVE

1. windows
2. shadows
3. trees
4. sunlight
5. buildings (structures)
6. soil

WHAT

1. Visual Works (hierarchy n … (1)
2. branches (plant component … (1)
3. campuses (1)
4. colleges (buildings) (1)

More 

WHERE

1. San Francisco, California (1)

WHO

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

WHEN

1. 1970 (1)
2. ca. 1970 (1)