REMOVE

1. soil
2. garages
3. black-and-white film
4. landscapes (representations)
5. sky
6. barriers

WHAT

1. Greenwich, Connecticut (1)
2. Visual Works (hierarchy n … (1)
3. bushes (1)
4. dogs (animals) (1)

More 

WHERE

1. Greenwich, Connecticut (1)

WHO

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

WHEN

1. 1956 (1)
2. 1956 April 11 (1)