Turbine Keychain

The turbine is one of engineering's genuinely beautiful objects: a ring of blades set at an angle around a hub, repeated with the sort of precision that only makes sense once you understand what it is doing to the air passing through it. Shrunk to pocket size, that radial pattern of blades still reads instantly, which is what makes it work as a keyring. It comes as a small multi-part set rather than a single lump, so there is a bit of assembly satisfaction in it. The subject suits anyone with an aviation or energy connection: engineers, pilots, plant technicians, aerospace students, or the sort of person who stops on a hill to look at a wind farm properly. As a gift it is easy to place, and it is small enough to run a handful off for a team or a graduating class.