The famous zipper marble!! Only a small number of these have been made, and they are legendary in their coolness. It's simply one of the best concepts I've ever heard of for a marble, ha ha, and to do it with electroforming - brilliance! An awesome opal sits at the end of a fumed ghost tube which wiggles its way up from the bottom of a DEEP vortex. There is great color throughout, and THEN you turn it over and see that backside - SOOO nice. It comes with the pictured stand made by Tim, signed on the bottom of the stand. Super centerpiece for any collection, a true work of fantastic art!