Illusion knitting is a knitting technique comprising stripes of color composed of slightly ridged (purl) and flat (knit) stitches which obscure each other when viewed from an oblique angle. The visible ridges are arranged in a pattern, producing the effect of a disappearing image.
It was a perfect opportunity to try this technique when I was asked to donate something for a charity auction at a convention for open source code and sci-fi/fantasy. The battle between copyright and copyleft seemed a perfect subject for an illusion scarf. After this successful test, I’m making the scarf in charcoal grey and mustard gold (after the Linux penguin). I decided to leave out the copyleft symbol and only include a copyright illusion, hoping the implication is not lost on the open source crowd.