Definitely one of the coolest designs the Mazet brothers have ever come up with, and I LOVE people's reaction to this marble! Typically the marble will just sit there on the stand, looking like an eyeball marble....but THEN you pick it up, flip it over, and BAM, there's this killer vortex drilling into the back of the eye! It's SUCH an awesome effect, and you too will LOVE this marble!! Really nicely made I should add.