This master marble is from Mark's Geometric series, each one of these a sweet piece of marble history! These incredible patterned marbles are made using the graal technique, with black glass layered over white and then the pattern meticulously laid on the marble and blasted away, then completed with a thick layer of crystal dipped and laid over the pattern which makes the whole thing absolutely pop in hand. The results are WONDERFUL, and these are some of the most magnificent marbles you'll ever behold! I've had very few of these marbles to sell over the years, as they are hard to come by, and even harder to let go of. This one is especially hard to let go of, there are 3 in the knot series, and this is probably the coolest! Signed 'Matthews 2005'.