RPF member Jeff Jenkins built this replica of the doomsday device as seen in the Futurama episode Time Keeps On Slippin', which implodes all the chronitons.
Scroll down for more details and photos. You can see some of the WIP shots in his thread here.
It's about 1/3 scale, as the one on the show was about the size of a basketball. The sphere and spires are solid anodized aluminum, while the face plate and tiny spheres are brass.