This toy is made of solid metal, fits in your pocket, and can continuously move. | Mashable

Spiranetics Kinetic Toy: a rotor rolls while magnetically connected to a helical track in this toy sold by The Nature Company in the 1990s. The clever geometry allows , with the right timing, the rotor speed can be ramped up by just rotating the helix in place- or to get it to higher rotation speeds the helix can come out of the base as demonstrated. This device is a fancy version of the Whee-Lo type toys- with physics of angular momentum, magnets, and combinations of rotational and translationa