This is one of my absolute top favorite styles ever from Nathan, the helmeted skull!! This is the first I've seen where he carved the spine coming out from the base of the skull and winding its way around the marble, along with some nerves, ha ha, so dang cool!! The nerve of this guy! I loooove Nathan's creativity, every piece is so crazy unique, it's one of the things that makes me love his work oh so much. Great colors in this one, and overall, this piece is just a blast in glass! These skull marbles are his signature pieces and an absolute MUST for every marble collection!! Signed with carved 'NG'.