REMOVE

1. fences
2. athletes
3. plants
4. automobiles

WHAT

1. Visual Works (hierarchy n … (1)
2. barriers (1)
3. black-and-white film (1)

More 

WHERE

1. Aiken, South Carolina (1)

WHO

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

WHEN

1. 1966 (1)