REMOVE

1. North American; Canadian
2. National Gallery of Canada
3. General Idea

WHAT

1. 15 gelatin silver transpa … (1)
2. 1825 units of vacuum-form … (1)
3. Photographs (1)
4. Sculpture (1)

WHERE

1. North American; Canadian (2)

WHO

1. General Idea (2)
2. National Gallery of Canad … (2)

WHEN

1. 1971 (1)
2. 1991 (1)