REMOVE

1. barriers
2. rivers
3. artists (visual artists)
4. monuments

WHAT

1. Visual Works (hierarchy n … (1)
2. benches (furniture) (1)
3. black-and-white film (1)

More 

WHERE

1. New York, New York (1)

WHO

1. Diane Still Knox; Diane K … (1)
2. Knox, Diane Still (1)

WHEN

1. 1958 (1)