It was closed when I came. That's OK because I think you get to experience what it was from looking at it from the outside. I believe it was US pavilion during the International Expo a while ago and they kept it up because it was so cool.
Luckily the sun came out when I got here so it reflected off this beautiful metal geometric sphere. Interestingly, it now has a Canadian flag in it.
We spent about 30 minutes here walking along the main path to an area with a jagged silver sculpture and a view of downtown Montreal. Worth a quick trip on the Yellow metro line.