Tim has been making great vortexes for a decade now, and they just jeep getting better, because this one is spectacular! I love interesting features inside of a vortex, because really, there's SO much you could do, whatever is left to the imagination. For example, that cool green glass rock that is hanging on the side of this vortex - what is that there? I don't know, but it makes me think, and it reminds me of a huge rock outcropping hanging off a cliff, making you wonder how that was formed billions of years ago. The texture and color inside this vortex is awesome, and then you've got the opal fumed tube rising from the depths. Then finally, you turn it over, and WHA-BLAM, there's that killer green sparkle color over top of a dimpled golf ball style. GREAT marble!!