REMOVE

1. sidewalks
2. bushes
3. sky
4. branches (plant components)
5. houses
6. public sculpture

WHAT

1. Visual Works (hierarchy n … (1)
2. automobiles (1)
3. buildings (structures) (1)

More 

WHERE

1. New Windsor, Maryland (1)

WHEN

1. 1966 (1)
2. after 1966 (1)