Summing up, in my opinion, each materia will end its life in a black hole, therefore perpetual motion is not possible, but one thing will exist very long (maybe infinitively) as there exist a black hole, simply gravitation.
Therefore gravitation is itself ala perpetual mobile imho.

Anyway, to build an experimental PM will be costly to.
What would you say about a little contest for the best PM with physX engine?

Regards, Robert

Quote
Everything should be made as simple as possible, but not one bit simpler.
by Albert Einstein

PhysX Preview of Cloth, Fluid and Soft Body

A8.47.1P