REMOVE

1. sky
2. rivers
3. parks (recreation areas)
4. sidewalks
5. 1964

WHAT

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

More 

WHERE

1. New York, New York (1)

WHEN

1. ca. 1964 (1)