Pin Ring

Part of the reason I've posted nothing in many moons is that I've been occupied with a really monstrous project in Sketchup. This isn't that project, but it's related to the same story.

It's meant to be a cutaway, yes.

If you can guess what its purpose is without checking the filename, you are probably smarter than me. If you can guess after checking, kudos are probably still in order.

Sketchup 8, rendered in Kerkythea 2008.