Man, I wish Kevin still made vortexes like this absolute gem from 2005. They are two-toned in that he twisted up his famous multi-colored fuming on the bottom part of the vortex and then added awesome dichro to the top part of the vortex - absolutely BRILLIANT!!! The marble reeeeeally revs up the deeper you get down into it. This is a special one you're going to want to nab for your collection because there just aren't enough of these out there. Finished off with his famous raked backside. So killer!!