This has been on my mind for a while now; and I really need some outside input to either expand or put this idea to rest. So this idea relies on the Meissner effect; which during the transition of a material from a natural state to a superconducting state the magnetic permeability of that material approaches zero, or is zero... I'm not really convinced, but... Let us assume it is zero. So you have a natural dipole magnet inside of a "special" cup that fits the magnet perfectly. When the "special" cup switches from it's natural state to it's superconducting state, what happens? Cross-section of my idea: http://meton.net/files/TEid1.png [Broken] My thoughts are that the function of permeability during the phase change is linear; therefore there will by an asymptotic change in the magnetic field through the cup. And my thoughts are that the natural magnet will be ejected from the cup at intense velocity; nearly relativistic velocity. But intuitively, i believe there must be a natural mechanic that will prevent his from occurring; I just can't think of one. Anyway tear this idea apart; I welcome it.