It can also be described as "the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear".
There is a scientific consensus that perpetual motion in an isolated system would violate the first and/or second law of thermodynamics.
Machines which extract energy from seemingly perpetual sources—such as ocean currents (or waves) —are capable of moving "perpetually" (for as long as that energy source itself endures), but they are not considered to be perpetual motion machines because they are consuming energy from an external source and are not isolated systems.
Quantum Function Follows Form theory and TIME.
The "eigen energy" of propeller shaped Fermions (the radiation products and rotational energy) is originated by the interaction with (and propulsion by) the external source of the massless Higgs particles oscillating as oscillating twin particles inside the Chiral Tetrahedral Vacuum Field Lattice.
We couldd call this particle system a TWIN BOXER Particle system.
The new "boson baby" found at the LHC, seems to prefer to decay (or transform) into pairs of other particles.
So the new boson could be a TWIN BABY with oscillating energy instead of real mass.
According to Q-FFF theory, both Higgs babies should oscillate as two opposing pistons in a boxer engine, creating the Planck length the "eigen energy" of fermions and the origin of dark energy.
I would call it the TWIN BOXER particle.
The local Higgs oscillation frequency combined with absolute reference frame motion is supposed to be the base for local time because it is supposed to be the origin of all particle and atom frequencies.
Conclusion: Local Time is based on the the local frequency of atoms like Ceasium.
Multiversal time however, is supposed to be based on the absorption rate of the Higgs system (probably few Fermions) by all pairing and splitting black holes together, after the Inflation epoch (see figure) leading to a Big Crunch.
The average Higgs oscillation length (twin boxer particle length) is supposed to be the origin of the Planck length.
The resulting "ocean wave energy"of the Higgs field is in this respect leading to perpetual motion of all Fermions and other Free energy effects around (New paradigm) Black Holes, such as (microscopic and astronomical) Black hole acceleration, particle "pair production" and radiation. http://vixra.org/pdf/1103.0097v1.pdf
Similar ideas are present in Vedic sciences, see:
The Perpetual Harmonic Oscillatory State (PHO)