REMOVE

1. workers
2. bushes
3. buildings (structures)
4. windows
5. barriers

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. beards (1)
4. boats (1)

More 

WHERE

1. Paradise Island, Bahamas (1)

WHEN

1. 1967 (1)
2. 1971 (1)
3. ca. 1969 (1)