What is this picture?

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What is shown in this image?

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pottery glaze crazing. # Pottery Glaze Crazing

Crazing—those fine cracks you see on some pottery—actually happens because the glaze and clay cool at different rates, creating stress like a frozen lake in winter. The wild part? Potters once considered this a flaw, but ancient Chinese ceramicists deliberately created crazing patterns (called "crackle") as a luxury feature, eventually making it worth more than smooth glazes.

Answer: pottery glaze crazing