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Whirls are figures constructed by nesting a sequence of polygons (each having the same number of sides), each slightly smaller and rotated relative to the previous one.
See also Daisy, Swirl
References
Lauwerier, H. Fractals: Endlessly Repeated Geometric Figures. Princeton, NJ: Princeton University Press, p. 66, 1991.
Pappas, T. ``Spider & Spirals.'' The Joy of Mathematics.
San Carlos, CA: Wide World Publ./Tetra, p. 228, 1989.
Weisstein, E. W. ``Fractals.'' Mathematica notebook Fractal.m.