Something I saw today happened to trigger a memory of the classic Spirograph toy we had as kids.  This was just too cool, and my sister and I had hours of fun with it.  It was very simple, gears and pins and a pen, but it made some really cool drawings.

I poked around online a bit and sure enough – there is a VIRTUAL SPIROGRAPH!

Sure, it’s not quite as fun as spinning the gears with a pen and seeing the image begin to emerge before your eyes, but it’s still pretty cool.