The Vortex marble was constructed in the same way as in the previous class. I had even more trouble keep the clear glass clear this time, as you can see from the images, and the underlying vortex is obscured. More is the shame, as it has glow glass intermixed in the vortex pattern and would look quite good if you could see it. Still, the bubbles look somewhat galactic in their spirals. And the backing came out nice, I went for a nebulae look to complement the typical outer space feel this kind of marble has.