My first encounter with a lot of the concepts of how robust QR codes are and how they work internally was Hackaday embedding logos in them[1]. Needless to say, QR codes are amazing and incredibly powerful<p>[1]:<a href="https://hackaday.com/2011/08/11/how-to-put-your-logo-in-a-qr-code/" rel="nofollow">https://hackaday.com/2011/08/11/how-to-put-your-logo-in-a-qr...</a>