A small gear, and a ruler which has a hole where the gear rolls about. Put the point of pencil in a small hole on the gear, and roll it. We have then a beautifully drawn flowery pattern ("spirograph"). The software Spirographer is a thing like that.
File Size1.74 MB
Operating System Macintosh Mac OS X 10.2
System Requirements
  • Mac OS X 10.2 or higher