REMOVE

1. barriers
2. clouds
3. houses
4. families

WHAT

1. Visual works (hierarchy n … (1)
2. abstraction (1)
3. black (1)
4. blue (1)
5. brown (1)

More 

WHERE

1. New York, New York (1)

WHO

1. Still, Clyfford (1)

WHEN

1. 1954 (1)