Typical example of quantum mechanics.... just because you can see it working does not mean it actually works.
It works as long as the temperature is kept low. Once the disc that guy is playing with warms up, it will no longer exhibit those cool properties.
If you want to know more about it, do a Google search on 'repulsive forces'. By the way, that does not mean what you are probably thinking- it is NOT the same force that makes a C-14 owner back away from a Feejer for example. That is purely an optical effect, this repulsive effect is actually physical.
Brian
I've seen this before but would love to understand it better. Obviously not entirely "locked". Some amount of force will move it from its "locked" position. What determines this locking force? Does it decay at all? Or is it permanent as long as the super conductor is maintained?
