About This File
Here's a 42 minute fun tutorial on creating a virtual Spirograph. The tutorial makes use of the MoGraph module and the "Tracer" object but there's a supplemental video tutorial below for those without the MoGraph module on how to simulate the tracer object with a regular spline. The tutorial is mainly using XPresso so if XPresso isn't your cup of tea then you may want to just play with the scene files only.
The tutorial is broken down into 2 parts for convenience. Unzip and open the html file with your browser. Also included is a supplementary tutorial on how to achieve the effect if you don't have the MoGraph module. A MoGraph and non MoGraph version of the scene file (R10 format) if you just want to have a play is included.