REMOVE

1. towers (building divisions)
2. trees
3. hats
4. stairs

WHAT

1. Visual Works (hierarchy n … (1)
2. artists (visual artists) (1)
3. black-and-white film (1)
4. chairs (furniture forms) (1)
5. doors (1)

More 

WHERE

1. Ensenada, Baja California … (1)

WHEN

1. 1949 (1)