REMOVE

1. cityscapes (representations)
2. scaffolds
3. bridges (built works)

WHAT

1. Visual Works (hierarchy n … (1)
2. banks (landforms) (1)
3. buildings (structures) (1)

More 

WHERE

1. Spokane, Washington (1)

WHO

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

WHEN

1. 1920 (1)
2. 1930 (1)
3. circa 1925 (1)