This animation shows the trace of the cat's eye being fixed on a wheel of a bicycle.

The applet was made by [url=http://tube.geogebra.org/lindner]Andreas Lindner[/url] back in the middle of 2000's. Andreas is one of the most productive contributors of GeoGebra's. Currently he is a member of the GeoGebra Team and also a university college teacher at the [url=http://ph-ooe.at]Pädagogische Hochschule Oberösterreich[/url].