REMOVE

1. sky
2. shadows
3. benches (furniture)
4. plants
5. rock
6. artists (visual artists)

WHAT

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

More 

WHERE

1. New York, New York (1)

WHEN

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