Acanthusleaf Design Studio created this ring based on a Diana Scarisbrick's book Historic Rings. In a closed position, it looks just like any other ring, but then you can "open" it up to look like a celestial globe:
This should probably be described as clockpunk because the original is early 17thC, but it has that totally industrial 19thC look, especially when closed. The original was gold, of course, but I've made this prototype in brass, riveted with silver, because that's what I had in convenient sizes of sheet and wire. We cannot wait around for sheet metal when obsessed, now can we?