REMOVE

1. backdrops
2. hats
3. shadows
4. buildings (structures)
5. roads
6. boys
7. rivers
8. automobiles

WHAT

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

More 

WHERE

1. New York, New York (1)

WHEN

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