The animation shows the magnetic field configuration
around a conducting non-magnetic ring (e.g. copper)
as it falls under gravity in the magnetic field of a
fixed permanent magnet. The current in the ring is indicated
by the small moving spheres. In this case, the ring
is light and has zero resistance, and is suspended below
the magnet. The motions of the field lines are in the
direction of the local Poynting flux vector.