Answer: Pottery glaze crazing

What you're looking at

Pottery glaze crazing is a common occurrence on ceramic and pottery pieces, visible on everything from decorative plates and vases to antique dinnerware. It happens naturally during the cooling process after firing in a kiln, when the glaze and clay body expand and contract at different rates.

This extreme close-up reveals the fine, interconnected web of hairline cracks that form across the glazed surface. The pattern looks like a complex maze or dried mud from this perspective, making it nearly impossible to recognize without context. The random, organic network of lines is what makes crazing so difficult to identify in zoomed photographs, even though most people have seen it many times on actual pottery.

Look for fine, interconnected networks of thin lines creating an organic, web-like pattern across a smooth surface.

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