REMOVE

1. rubbish
2. windows
3. sky
4. farmhouses
5. artists (visual artists)
6. black-and-white film

WHAT

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

More 

WHERE

1. Westminster, Maryland (1)

WHEN

1. 1961 (1)
2. after 1961 (1)