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You have probably arrived at this page because you scanned the wall-hanging, or a photo of it, elsewhere.

I have been thinking about knitting a large-scale QR code for several years. I wanted it to look as little like a QR code as possible, which is rather perverse as the whole purpose of a code is that people can instantly recognise it and scan it with a phone. Some of my ideas were very complicated and I could not be sure that they would work. Eventually I decided to try a simple version first. There may be others later.

QR codes differentiate between light and dark so the actual colours don’t really matter. My first attempt, which I pulled undone, had many more colours than the final version. I thought it looked very messy so eventually settled for four dark, and four light, colours, on the principle of the ‘four-colour map theorem’.

There is no pattern for this design.