REMOVE

1. boats
2. ships
3. oceans
4. hills
5. yellow

WHAT

1. birds (animals) (1)
2. exterior views (1)
3. geese (animals) (1)
4. plants (1)
5. rivers (1)
6. silver gelatin (1)
7. travel (1)
8. trees (1)
9. Visual Works (hierarchy n … (1)
10. water (1)

Less

WHO

1. Clyfford Still; Still, Cl … (1)
2. Garske, Patricia; Patrici … (1)
3. Still, Clyfford (1)
4. Still, Patricia Alice Gar … (1)

More 

WHEN

1. 1956 (1)
2. c. 1956 (1)