I was firing some pottery this summer and apparently did not dry and pre-heat sufficiently. There must have still been moisture in the clay, and it blew off a spall. Grinding the spall to shape, and drilling a hole, with stone tools, I made a pendant. The pot was imprinted by rolling a corn cob over the surface before drying. Pots were often imprinted to make it easier to grip a slippery pot. Also, the texturing gave the pot more surface area which made heat transfer more efficient during cooking. This texturing helped to protect the pot from thermal shock.
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