REMOVE

1. moustaches
2. rivers
3. portraits
4. benches (furniture)
5. buildings (structures)
6. plants

WHAT

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

More 

WHERE

1. New York, New York (1)

WHEN

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