REMOVE

1. sky
2. plants
3. houses
4. buildings (structures)
5. curtains (window hangings)

WHAT

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

More 

WHERE

1. Westlock, Alberta, Canada (1)

WHEN

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