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===Nested Spheres===
It is possible for a crystal sphere to contain another crystal sphere, or a series of smaller and smaller crystal spheres.<ref>[[AD%26D_Adventures_in_Space#Concordance_of_Arcane_Space|''Concordance of Arcane Space'']] Nonstandard Systems sidebar pages 68, 70 and 72</ref>
==See also==
* [[:Category:Crystal spheres|Crystal spheres Category]] (the category for crystal spheres)
* [[SJA3 Crystal Spheres]]
==References==
<references/>
==External links==
