Christopher Chapman's Oscar-winning documentary short "A Place to Stand" got produced for the Ontario pavilion at the 1967 Expo held in Montreal that year. A kaleidoscopic look at Canada's most populous province, the documentary uses multi-dynamic image technique (wherein multiple images shirt simultaneously on panes). The viewer gets to see lots of the things that make Canada great. There's a reason why Michael Moore has so much praise for our northern neighbor. A well done documentary that deserved its Oscar. I recommend it.
As for multi-dynamic image technique, Norman Jewison used it in "The Thomas Crown Affair", and it also featured prominently in the opening sequence of "The Brady Bunch".