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General Support for Transparency in 2D & 3D
Mathematica 6 allows any level of transparency in 2D and 3D.
In[1]:=

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Table[Graphics3D[{Opacity[1 - o], 

   PolyhedronData["GreatRhombicosidodecahedron", "Faces"]}], {o, 0, 1,

   1/5}]
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