Published on 10 October 2008
If you wanted to design your own bank notes or passport you might consider using a Guilloché pattern as one of your anti-counterfeiting measures.
I first heard about Guilloché patterns in a recent post over at the Ministry of Type blog run by Aegir Hallmundur. Guilloché machines (also known as geometric lathes) have been used since the 17th century by watchmakers and goldsmiths, such as Fabergè, for for ornamentation.
Using the set of Hypotrochoid equations Aegir describes I've built a little Flash app to experiment with the various parameters. Click the picture below to play.
Last updated: 20 October 2008