One thing I will probably reference quite a bit on this blog is the great Teachat Special offers which start with Hagi Yaki, but since have broadened their gaze to the Teaware artisans that contribute to the board.
Sadly I did not jump in on the Special offers until the 8th one, which happened to be these small yunomi's. The taper on these are rather extreme, but they are made with extra rough sand. The term for Hagi yaki using this extra rough sand is "Oni-hagi" which I have heard various translations, but its a Demon, or Ogre or Troll hagi, basically it means its a bit rough, and borderline unrefined. That being said I have seen Oni-hagi of many types from loaded with large grains of sand, to clay that feels rough, but its outward appearance is rather refined.
The artist of this piece is Yamane Seigan, who is both a Martial Artist and a semi famous artist. I say semi famous as he is well known at least in the West, but his work does not warrant the hefty price tags that certain other artists works do.