REMOVE

1. windows
2. buildings (structures)
3. lamps (lighting devices)
4. sky
5. 1970

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. ca. 1970 (1)