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Reference.org
Seashell surface
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<p>In mathematics, a seashell surface is a surface made by a circle which spirals up the <i>z</i>-axis while decreasing its own radius and distance from the <i>z</i>-axis. Not all seashell surfaces describe actual <a href="/facts/Seashell/5AyVlBwo">seashells</a> found in nature. </p>