Spiny!

This spiny thing (don't know what to call it) used to sit atop a sign advertising a supper club in Flint, MI. We used to drive by it occasionally when I was a kid, and I always liked it. I especially liked it at night, because it was lit up and rotated. Now, it's relocated to a run down old shopping mall in Flint, part of a collection of old signage. I see these pretty often in old photos, they must have been a common design motif at one time.