Artist and designer Frank Haase (Open Air QR Code Art, QR Code Sculpture) has taken Patrick Donnelly’s idea of a QR Code on the sole of your shoe one step further (pun intended!). Frank sent me a picture of his prototype and I have modified the contrast/brightness to better show the details (image below). Frank said “I made a lot of prints with water on my terrace, which is of granite and changes the colour enormously – dependent on if it’s dry or wet. Sometimes I only got a half print, sometimes I got a quarter of it. But in some few cases they were good enough to be used by the i-nigma reader, sometimes also by kaywa. But I had problems with quickmark – all my tries to scan the shoe print with quickmark failed”.