REMOVE

1. monuments
2. sweaters
3. benches (furniture)
4. sky
5. rivers
6. barriers

WHAT

1. Visual Works (hierarchy n … (1)
2. automobiles (1)
3. black-and-white film (1)
4. bushes (1)
5. doors (1)

More 

WHERE

1. Greenwich, Connecticut (1)

WHEN

1. 1956 (1)
2. 1956 April 11 (1)