A so-called Moiré pattern occurs when two similar repeating patterns are almost but not quite superimposed. The Moiré pattern is a kind of interference pattern. In this case, the basic pattern consists of lines radiating out from a common center. One copy of this pattern is fixed, and the other drifts about, creating a changing interference pattern.

You can start and restart the applet by shift-clicking on the pattern. You can also click-and-drag to control the motion of the pattern yourself.

If your browser supported java you would see an applet here

Click here to see the source. This applet is configurable with a number of parameters. See the source for details.

You can find more of my Java work at

David J. Eck (