Basin Pictures

Forced Damped Pendulum

...with Four Basins
Even something as simple as a periodically forced damped pendulum can have complex behavior. The computer-generated images below show initial positions that asymptote to one of different behaviors (one color for each behavior). For example, orbits starting at points in the blue region would yield a different type of motion from orbits starting in the red region. The brighter the shade of color, the longer it takes to settle into the corresponding motion. The different regions are separated by fractal basin boundaries. The pictures are made at increasing magnification levels.

Picture #2
not available.

...with Two Basins
Same as above except the parameter values are slightly different so there is only two attractors in this case instead of four. Here, lighter shades of color represent points that settle down more slowly.

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Fractal Foam

There are three simple attractors (straight lines in fact!) which formed sort of a triangle; however, the basins of attraction is anything but simple. These pictures are the starting points for the interesting ideas of riddled basins.
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Wada Basins

While many chaotic systems possess boundaries separating basins that are typically fractal, they may also possess the stronger property that any point which is on the boundary of one basin is also simultaneously on the boundary of all the other basins. This interesting property is known as the Wada property. Wada boundaries are to be contrasted with more usual boundaries such as those on a map showing the countries of Europe: there is only a finite number of boundary points that are on the boundary of more than two countries. A simple system exhibiting this interesting Wada property is the three-disk model studied extensively in the context of chaotic scattering. For more information about Wada basin boundaries in this system, check out the paper "Wada Basin Boundaries in Chaotic Scattering."

Coherent Structure

This is not exactly a basin picture, but I didn't feel like creating a new page just for this one picture. However, this is still a special picture for me as it is my first published chaos artwork! For details, check out the paper "Controlling Complexity."


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