REMOVE

1. sidewalks
2. sky
3. plants
4. trees
5. artists (visual artists)
6. buildings (structures)

WHAT

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

More 

WHERE

1. New York, New York (1)

WHEN

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