[mrguyorama]

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

[1]:https://hackaday.com/2011/08/11/how-to-put-your-logo-in-a-qr...

[hdhzy]

QArt is also worth mentioning: https://research.swtch.com/qart