From this, I learned that making your URLs uppercase makes for a more compact code! The links at the bottom are great reads as well, especially:
https://research.swtch.com/qart
I hope that QR codes become more widely used, now that iOS and Android both include QR capabilities directly in the native camera apps.
[0]: https://baike.baidu.com/item/%E4%BA%8C%E7%BB%B4%E7%A0%81/238...
A simple URL I can read and remember for later, good luck memorising a QR code.
I’ve seen too many obvious examples of a marketing team getting carried away and abusing these things. The most absurd one was on a police notice on the London Underground advising people to take care to hide their valuables from thieves. How could you find out more? By taking your 800 dollar valuable out to scan the QR code...