Start with any triangle in a plane (any closed, bounded region in the plane will actually work). The canonical Sierpinski triangle uses an equilateral triangle with a base parallel to the horizontal axis (first image).
Irish artist Nuala O'Donovan sculpts intricate hand-built porcelain forms that resemble fractal patterns found in nature. Borrowing from shapes found in coral, teasel flowers, and pinecones, O'Donovan examines not only patterns, but irregularities.
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