A wire-frame model of a champion swimmer slices through the water, her arms moving in slow motion.

But instead of moving the wire to bring those domains under the heads, in the way that a spinning hard disk would, his device moves the domains themselves along the wire, using an electric current.

And, of course, you could take, if your loop doesn't move over time, I mean there is a different story if you start somehow taking your wire and somehow moving it inside the field.