REMOVE

1. plants
2. soil
3. hills
4. workers
5. coats (garments)
6. buildings (structures)

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)