Been a huge fan of QR codes since the beginning. URLs are awesome, and QR codes are a way of putting links in the real world. Obviously awesome! There was a dark period in the early 2010s where everyone I said this to sent me a link to an empty tumblr "people scanning at codes", but I'm glad they've gotten more traction. Took a trip to Santiago this past week, and they are ubiquitous: from room service and connecting to WiFi to menus in every restaurant. Super cool.