REMOVE

1. buildings (structures)
2. rock
3. garages
4. roads
5. rubbish
6. automobiles
7. sky
8. plants

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)