REMOVE

1. hats
2. houses
3. curtains (window hangings)
4. sky
5. bushes
6. buildings (structures)

WHAT

1. Visual Works (hierarchy n … (1)
2. black-and-white film (1)
3. children (1)

More 

WHERE

1. Westlock, Alberta, Canada (1)

WHEN

1. 1946 (1)
2. after 1946 (1)