I was reading a comment up about them being a masterpiece (eg - final exam project before graduating apprenticeship), but the geographic distribution made me th

I was reading a comment up about them being a masterpiece (eg - final exam project before graduating apprenticeship), but the geographic distribution made me think they could be hand warmers, bed warmers, or room warmers. Like, light something and "hang" it in the middle. But, I like this theory, too, so it has my support.