  We report observations on very low density limit of one and two balls,
vibrated in a box, showing a coherent behavior along a direction parallel to
the vibration. This ball behavior causes a significant reduction of the phase
space dimension of this billiard-like system. We believe this is because the
lowest dissipation process along a non-ergodic orbit eliminates ball rotation
and freezes transverse velocity fluctuations. From a two-ball experiment
performed under low-gravity conditions, we introduce a "laser-like" ball system
as a prototype of a new dynamical model for very low density granular matter at
nonequilibrium steady state.
