No Stupid Questions
No such thing. Ask away!
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QR codes can have arbitrary looks even without dirty tricks (abusing the error correction to add a logo or taking advantage of central sampling to color all but the middle 3x3 square of each data pixel) but boy, is it hard.
Examples:
https://lemmy.sdf.org/post/31694735/18805217 (strings a long number in Number mode (3 decimal digits per 10 bits) to the URL, and somehow the resulting number turns out to be a small even number times a very high power of 2)
https://www.youtube.com/watch?v=qQkWjzqMbuA (uses padding bytes plus maybe some of that "intentional damage" in QR codes with logos)
OK, I was actually asking about accidental things, but this is pretty neat.