Forty miles of film, shot all over the province of Ontario. Three-hundred-and-fifty pages of notes. All woven by Christopher Chapman into one short movie called A Place to Stand - the cinematic centrepiece of Expo 67.
It looks kind of old fashioned today but the process he invented called "multiple dynamic images" was groundbreaking. He filled the big screen with various smaller screens, each showing something slightly different.
The film won Chapman an Academy Award - which, with characteristic humility, he subsequently used as a doorstop. He died this past weekend in Uxbridge, Ont. at the age of 88.