@ringo @newt thinking about "easily writable" versus "physically durable" and I wonder if your best bet isn't a decently high resolution laser printer and paper suitable for archival

or a microfilm printer. if we're encoding as a block grid similar to a QR code I wonder what sort of information density that medium can handle

inb4 reinventing optical disks. I don't need to worry about the shelf life of laser printed paper. now we just need someone to work out a paper based parity specification similar to RAID ...