^^^My current favorite magnetic device - The Magnevex.
It uses a Fibonacci spiral array of magnets on external vortices, which rotate in tandem. Without reproducing the design, I have no idea if it would actually work, but I know that the creator (as well as many other people) are making a huge mistake using aluminum for any part of a magnet motor, since aluminum DOES in fact react to magnets. It creates a braking effect.
Don't believe me? Drop a 5kg magnet onto a 1" thick aluminum plate... bet it makes very little noise...
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
