This marble just flooooows, top to bottom, from the moment you swim down into the interior double fumacello with an opal being generated on top, to the ending peace you find as you slip over the edges and find such colorful fluidity on the backside. The fumacello is pulled down into a somewhat vortex effect, with the opal nested right on top. The assym backside on this one is one of the nicest, most beautiful I've seen. Awesome!!