It was, surprisingly, attributed to an external air circulation effect that acted somewhat like an air-cycle refrigeration device, cooled the upper exterior of the dome shaped structure so that clouds formed in the cold air sucked in, and it rained on all the guests.

It dampened the spirits the attendees at what what was supposed to be a joyous unveiling of Bucky's "miracle of modern architecture."

Bucky had an "interesting" career, well worth taking a glance, if you can find a short account. Too bad he didn't stick around to hear about the recent discovery (claimed) of naturally occuring "bucky balls" in extragallactic space. He'd have been quite proud, and would have told us ... and told us ... and ... ... how he invented them.

John