REMOVE

1. platforms (general)
2. barriers

WHAT

1. Visual Works (hierarchy n … (2)
2. men (male humans) (2)
3. platforms (general) (2)
4. artists (visual artists) (1)

More 

WHERE

1. 128 W. 23rd St., New York … (1)
2. Aiken, South Carolina (1)

WHO

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

WHEN

1. 1959 (1)
2. 1966 (1)