REMOVE

1. boats
2. barriers
3. 1971
4. 1970

WHAT

1. Visual works (hierarchy n … (2)
2. buildings (structures) (2)
3. graphite pencils (2)
4. houses (2)
5. railroad stations (2)

WHO

1. Still, Clyfford (2)

WHEN

1. 1925 (2)
2. 1931 (2)
3. circa 1925–31 (2)