Don't discount the possibility of a joke. Wouldn't it be fun to make an assembly of PVC pipe, lights, a motor, batteries, and a large balloon, launch it, and watch people make up excuses about what it is?

Actually, I remember where I first heard the idea, and if I recall correctly it was a triangle over Arizona somewhere. I don't recall whether the joke hypothesis was based on seeing the thing fly or seeing the thing be assembled or hearing reports from the people who assembled it. I'll forward a pointer to your article to the person I heard it from and see if he wants to share what he knows.