REMOVE

1. boys
2. shadows
3. buildings (structures)
4. black-and-white film
5. parking lots
6. automobiles

WHAT

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

More 

WHERE

1. San Francisco, California (1)

WHEN

1. 1970 (1)
2. ca. 1970 (1)