REMOVE

1. sky
2. trees
3. rock
4. coastlines
5. 1945

WHAT

1. buildings (structures) (1)
2. cliffs (1)
3. exterior views (1)
4. landscapes (representatio … (1)

More 

WHERE

1. Alberta, Canada (1)

WHO

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

WHEN

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