[memco]

Apple has something like this for their new iOS device setup. I don’t think it’s to encode larger amounts of data, but for security they have this circle that constantly changes shape (see around 0:50 in this video for a demo: https://youtu.be/iE03ypWD5xs). I don’t know for sure how it works, but my first thought was a constantly changing QR-like code.

[xav0989]

Someone asked a very similar question on the apple stack exchange[1]. Apple also filed (at least) two patents on the technology[2][3].

[1]: https://apple.stackexchange.com/questions/301563/what-is-the...

[2]: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=H...

[3]: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=H...