REMOVE

1. plants
2. clouds
3. sky
4. bushes
5. horizon line

WHAT

1. Visual Works (hierarchy n … (1)
2. color film (film) (1)
3. fields (land) (1)

More 

WHERE

1. Westminster, Maryland (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Still, Clyfford (1)

WHEN

1. 1964 (1)
2. circa 1964 July (1)