Forgotten, hell. Picasso said it--"Good artists copy, great artists steal."
I think Banksy said that,
That mark is useless without the table that tells you what each distance represents. So on that matchstick you haven't stored data, merely a hash of that data.
Incorrect: as long as you can measure that mark as a distance with arbitrary precision you can use that to convey any amount of data. For instance, your distance could be 0.7269767679 mm, which, with a simple 1:1 dec to ascii conversion is 0.HELLO, assuming you use fractions of a millimeter for your data. See? With infinite precision comes infinite data. Infinite precision is, of course, difficult to impossible in the real world, but that's never stopped me before.
I have a theory that it's impossible to prove anything, but I can't prove it.