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The

pattern is a set of random tiled polygons. With a large scale and no turbulence it makes a pretty good stone wall or floor. With a small scale and no turbulence it makes a pretty good crackle ceramic glaze. Using high turbulence it makes a good marble that avoids the problem of apparent parallel layers in traditional marble.**crackle**

Mathematically, the set crackle(p)=0 is a 3D Voronoi diagram of a field of semi random points and crackle(p) < 0 is the distance from the set along the shortest path (a Voronoi diagram is the locus of points equidistant from their two nearest neighbors from a set of disjoint points, like the membranes in suds are to the centers of the bubbles).

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