Gregory's Server@manawyrm do it with ferrite beets, it’s basically magnetic tape..
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 @manawyrm @janamarie take the magnet strips from public parking liftgates and glue them together, forming a strip. @manawyrm @janamarie P.S. do not drive up with cargo bikes to those lift gates. they may hand you paper cards automatically without even pressing a button... and may even repeat the process, if you accidentally move the bike in the "wrong" pattern. |
@janamarie 😹 ...
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hmm....
Now I wonder what the weirdest thing you could feed and still record some sort of recognizable audio is.