The pattern-like cracks on the surface of pottery are called "Kannyu".
The glaze melts and forms a glass-like layer which covers the clay. The cracked patterns are created in the process of decreasing the temperature of the pottery itself after firing due to the difference in shrinkage between the base clay and glaze.
The Kannyu design in pottery has been fascinated as Wabi-Sabi beauty in Japan since ancient times.
height 2.3 inches (5.8cm)/diameter 8.3 inches (21.0cm)/weight 15.0 oz(430g)
*There are slight differences in size, weight, color and pattern.