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A *fractal* is a geometric figure containing a pattern repeated at
different scales. Fractal objects are *self-similar* in that their
parts represent the whole like a branch resembles a tree or a tributary
imitates a river. This property occurs frequently in nature, from ferns to
galaxies, and from sea shells to lunar craters. Though present since the
beginning of time, fractals have only been studied scientifically for about
a century. Georg Cantor investigated some of their concepts in the 1870's,
and Benoit Mandelbrot discovered the mathematical set bearing his name in the
early 1980's. Mathematicians and physicists who studied fractals include
Michael Barnsley, Mitchell Feigenbaum, David Hilbert, Gaston Julia, Helge
von Koch, Edward Lorenz, Karl Menger, and Waclaw Sierpinski.

Fractal objects are too irregular to be studied using traditional techniques of geometry, so extensions have been derived to a handle their uniqueness. When such designs with repeated patterns are compared at various scales, a numeric value called a "fractal dimension" may be obtained, to indicate how densely the object occupies space. However, it may not be a whole number, but instead it may contain a fractional part. A normal line or curve has a dimension of 1; a regular surface has a dimension of 2; and a geometric solid has a dimension of 3. But a fractal "gasket" may have a dimension of 1.585, or a fractal "sponge" dimension 2.727, for example. Fractal dimensions are used in natural science to compare the complexity of irregular objects such as coastlines, dendritic patterns, and even weather.

The term "fractal" was coined in 1975 by Benoit Mandelbrot. It comes from
the Latin adjective *fractus*, meaning "broken". I use "fractures",
a contraction of the words "fractal pictures", as the name of my line of
fractal note cards (#1 is Mandelbrot Set, #2 is Classic Fractals), fractal
posters (Galaxy), fractal t-shirts (Starfish and Limpet), and fractal spinner
tops (five designs). The colorful computer generated fractal pictures
illustrate the complementary effect of blending art and science, mixing
intuitive and analytic worlds. They are examples of mathematical structures
which simulate beauty and order in the natural world. Fractals are complex
geometric designs constructed using *recursive algorithms* -- that is,
by repeatedly applying a simple set of formulas or rules at various levels.