REMOVE

1. plants
2. automobiles
3. neckties
4. buildings (structures)
5. sitting
6. hats

WHAT

1. Visual Works (hierarchy n … (1)
2. black-and-white film (1)
3. bushes (1)
4. columns (architectural el … (1)
5. exterior views (1)

More 

WHERE

1. New Windsor, Maryland (1)

WHO

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

WHEN

1. 1966 (1)
2. after 1966 (1)