This is a HUGE and super fascinating marble from James. Somehow he was able to manipulate the fuming into interesting angles which make the glass look like a petrified alien backbone swirling down into the deep depths of this vortex, and it is indeed a nice deep one. You'll have tons of fun exploring the inner workings of this unusual marble!! You don't see many marbles in this 3 1/4" range, as not many artists have the torch or gumption to pull it off. This is an AMAZING deal for this marble, priced to sell.