REMOVE

1. sidewalks
2. black-and-white film
3. streets
4. rock
5. 1966
6. 1964

WHAT

1. Visual Works (hierarchy n … (1)
2. arcades (structural assem … (1)
3. artists (visual artists) (1)
4. barriers (1)
5. benches (furniture) (1)

More 

WHERE

1. New York, New York (1)

WHEN

1. ca. 1964 (1)