REMOVE

1. barriers
2. platforms (general)
3. automobiles
4. 1966

WHAT

1. athletes (1)
2. black-and-white film (1)
3. horses (animals) (1)
4. men (male humans) (1)
5. plants (1)
6. polo (field sport) (1)
7. polo clubs (built complex … (1)
8. polo fields (1)
9. sky (1)
10. spectators (event observe … (1)
11. sports uniforms (1)
12. trees (1)
13. Visual Works (hierarchy n … (1)
14. woods (plant communities) (1)

WHERE

1. Aiken, South Carolina (1)

WHO

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