No older work is cited in the copyright information, but any classical magical circle would be public domain anyway. That said, I'd be surprised if they were based heavily on older forms, as they feel artistically similar to his other art, and it seems like it would be more trouble to research this sort of thing than to make it up completely..
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branchandroot
no subject
Date: 2007-03-14 10:05 pm (UTC)no subject
Date: 2007-03-14 10:21 pm (UTC)