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This hourglass is filled with black iron fillings instead of sand. Set the device on its stand and watch the grains arrange themselves into mesmerizing stalagmites in the lower chamber of the hourglass. The trick? A powerful rare earth magnet is hidden in the base. Each time you flip it, unique sculptures form as the ferrous metal gets drawn into the magnetic field. This unique device is a reinvention of the traditional sandglass, but instead of a boring pile of sand, you are presented with a visually striking display which you'll never get tired of watching over and over again as. Just remember that this is not intended for use as an egg timer.