REMOVE

1. sky
2. exhibitions (events)
3. New York
4. 1952-1999

WHAT

1. Visual Works (hierarchy n … (2)
2. black-and-white film (2)
3. buildings (structures) (2)
4. bushes (2)
5. children (2)

More 

WHERE

1. New Windsor, Maryland (1)
2. Westlock, Alberta, Canada (1)

WHO

1. Campbell, Sandra L. Still (1)
2. Clyfford Still; Still, Cl … (1)
3. Sandra L. Still Campbell; … (1)
4. Still, Clyfford (1)

More 

WHEN

1. 1946 (1)
2. 1969 (1)
3. after 1946 (1)