REMOVE

1. trees
2. sky
3. soil
4. hills
5. clouds
6. sunlight

WHAT

1. black-and-white film (1)
2. fields (land) (1)
3. horizon line (1)
4. landscapes (representatio … (1)
5. plants (1)
6. silhouettes (1)
7. Visual Works (hierarchy n … (1)
8. woods (plant communities) (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Sandra L. Still Campbell; … (1)

WHEN

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