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When an object is cloned, an exact copy of the object is made.  The clone
will have the same color, shading, and other properties as the original
object.  Both light sources and volumes can be cloned.  For geometric object,
a complete copy is made, but for volumetric objects, the voxel data is not
copied.  Both the original object and the cloned object use the same data
values.  Currently, there is no way to modify the data values within the
VolVis system, so this fact is transparent to the user.

Since the cloned object has the exact same position as the original, it will
not immediately be visible (since both objects exist in the same location).
Move either the original or the clone to see both objects.
