OK, so here is a fascinating marble - on the one side, you see this gorgeous rainbow dichro, super silky smooth and flowing into the depths. But then when you flip it over, you get a totally different look, with these circles which have a petrified wood grain appearance, VERY interesting glass! I don't know for sure how Kevin achieved that effect, and it's the only marble I've ever seen from him with it, making it very hard to let go of. I think it may be a type of millie cane, but I could be wrong. Whatever it is, it is AWESOME!! Signed with Kevin's 2004 sig chip.