Sōmayaki (相馬焼) or Ōbori Sōmayaki (大堀相馬焼) is a form of pottery. It is characterized by its green color and blue cracks on the surface. Much of it is multi-layered. Many pieces have a stylized horse painted in metallic gold.
Because ma in sōma means "horse", calligraphic horses are painted on many pieces.
A very rare character of Sōmayaki pottery is its multi-layered structure.
The dual layering of the pottery insulates the hot liquids to keep them hot and keeps the outside cool, so one don't burn one's hands.