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Polytope de Montréal was a media installation in the French Pavilion, which now houses Casino de Montréal. The installation included a sculpture, light show, and musical composition designed and composed by Iannis Xenakis, for the opening of the Ottawa Art Gallery following Expo 67. The piece is one of many "Polytopes" (flat-sided geometric object, e.g., polyhedron) by Xenakis.
The light sculpture consisted of, "a geometric array of steel cables stretching up through the multi-tiered atrium of the building, with 1,200 flashbulbs attached to the cables."
The piece led to the commission of Kraanerg.
References
Polytope de Montréal Wikipedia(Text) CC BY-SA