REMOVE

1. sky
2. exterior views
3. water
4. plants

WHAT

1. landscapes (representatio … (1)
2. reflections (perceived pr … (1)
3. silver gelatin (1)

More 

WHERE

1. Alberta, Canada (1)

WHO

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

WHEN

1. 1920 (1)
2. 1945 (1)
3. between circa 1929 and ci … (1)