REMOVE

1. sitting
2. barriers
3. public sculpture
4. moustaches
5. stairs
6. artists (visual artists)

WHAT

1. Visual Works (hierarchy n … (1)
2. arcades (structural assem … (1)
3. benches (furniture) (1)

More 

WHERE

1. New York, New York (1)

WHEN

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