REMOVE

1. black
2. red
3. houses
4. horses (animals)

WHAT

1. Visual works (hierarchy n … (1)
2. dogs (animals) (1)
3. farming (1)
4. farms (1)

More 

WHERE

1. Bow Island, Alberta, Cana … (1)

WHO

1. Still, Clyfford (1)

WHEN

1. 1920 (1)
2. 1924 (1)
3. circa 1920–24 (1)