REMOVE

1. stairs
2. shadows
3. libraries (buildings)
4. benches (furniture)
5. artists (visual artists)

WHAT

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

More 

WHERE

1. New York, New York (1)

WHEN

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