REMOVE

1. sky
2. rubbish
3. fields (land)
4. trees
5. hats
6. 1961

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. black-and-white film (1)
4. buildings (structures) (1)
5. bushes (1)

More 

WHERE

1. Westminster, Maryland (1)

WHEN

1. after 1961 (1)