This marble is Devin's absolute specialty design. All of the millies contained inside this vortex were created by him, and he is GOOD at it. His millie are often sold as inidividual slices for good chunks of change, and this vortex is chock full of them! He lines the inside of the vortex with his millies and then twists it all up into the depths. Awesome concept, and so fun to explore. Killer backside as well, and I love the colors throughout this marble!