A small strong magnet is sitting on a sample of YBa2Cu3O7-x.
Liquid nitrogen is added and the YBa2Cu3O7-x
cools and changes into its superconducting state, resulting in levitation
of the magnet.
A small strong magnet levitating above a superconducting sample can
be spun. No matter what the orientation of the magnetic field, the field
lines are still repelled by the superconductor.
While it is possible to levitate one magnet using another magnet, it
is not possible to maintain levitation between magnets when one of them
When the superconductor warms above its critical temperature, the
magnet field is no longer repelled and gravity wins.