REMOVE

1. houses
2. shadows
3. windows
4. streets
5. automobiles
6. lamps (lighting devices)

WHAT

1. Visual Works (hierarchy n … (2)
2. black-and-white film (2)
3. bushes (2)
4. fields (land) (2)

More 

WHERE

1. New Windsor, Maryland (1)
2. Westminster, Maryland (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Clyfford Still; Still, Cl … (2)
3. Sandra L. Still Campbell; … (1)
4. Still, Clyfford (2)

Less

WHEN

1. 1966 (1)
2. 1969 (1)
3. ca. 1966 (1)