REMOVE

1. silhouettes
2. clouds
3. roads
4. farmhouses
5. fields (land)
6. barns
7. benches (furniture)

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. branches (plant component … (1)
4. buildings (structures) (1)

More 

WHERE

1. New York, New York (1)

WHEN

1. 1964 (1)
2. ca. 1964 (1)