Comments by "Chaos Corner" (@chaos.corner) on "I built a QR code with my bare hands to see how it works" video.

  1. Color has problems with B&W photocopiers and thermal printers tho. Microsoft might feel a bit vindicated though. They were trying to push their own version of qr codes with color on Windows phones when QR codes were getting popular.
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  2. It gets crazy in the ways it can be applied too. You can split a message into a number of parts and have it so that the code can be recovered when you only have at least (and not less than) a certain fraction of the parts. For instance, you can have a private key, divide it into three parts and require at least two of the parts be available to recover it. And it can get more complex than that too.
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  3. Although QR codes are often thought of as black or white or with some artsy embellishments, it's possible to abuse the parameters so much that I was able to hide a QR code in a picture so that it was nearly completely invisible to the human eye (you could still make out the registration marks if you knew what you were looking for - and I think I could have hidden those with a bit more work).
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  4. The bit about hamming distances is reminiscent (hypercube and all) of a bit I just saw in a video about reversing Conway's Game of Life. I wonder if there are correlations there.
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  5.  @PaulZeroSolis  Feature phones could do QR codes too, no problem.
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  6.  @wellhellothere6347  Indeed you can. The Nokia 2760 Flip for example. You can also get flip smartphones now if that's your thing.
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