I've been thinking about fun little artistic things to do with QR codes. What if each individual pixel were a QR code? There's two fundamental problems with that idea. Firstly, a QR code needs whitespace around it in order to be scanned properly. So I focussed on the top left positional marker. There's plenty of whitespace there. Secondly, because QR codes contain a lot of white pixels inside them, scaling down the code usually results in a grey square - which is unlikely to be recognised…