This completely mesmerizing piece was carved from a huge 3" hollow marble with three layers of color. It boggles my mind how many right angles are found....on this SPHERE. Ha ha! Nathan is a genius. This is a fragile piece for sure, but it's still tough boro and not as fragile as you might think. It's amazing to turn around in your hand though and study the angles and dimensions of it, as they are endless. More crazy awesomeness from the master! Signed with carved 'NG' insignia.