Hi Bettina - Thank you for visiting our portfolio. It's difficult to explain the process in this short format. There's a helpful article in The Journal of Light Construction that addresses this topic: http://www.jlconline.com/projects/design-build/decorative-shingling_o But this lettter in Fine Homebuilding Magazine is even simpler: http://www.finehomebuilding.com/how-to/qa/weaving-patterns-in-sidewall-shingles.aspx Have fun with your project!