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\label{sec:bugs}

Many of the known limitations arise from limitations of the underlying
libraries.  Particularly, the physics library only supports collisions
between balls and other shapes (ie, it does not support arbitrary
pairs of objects to be collided).  As such, we can only model a subset
of the conceivable \Gizmoball physics (though it is sufficient for
what we were trying to achieve with the standard gizmos).

There is also some limitation imposed by the use of properties because
properties are often not useful unless the system using the properties
understands the names of the properties.  While the limitations of
this are far less than they would have been without the generality of
the properties system, it still forces some knowledge on the other
systems.