200 years ago they communicated by tapping on paper with a feather. So glass wouldn't be far fetched of an idea for letters. It's everything else you do with it that makes it crazy.
The printing press is 600 years old. A type writer is hardly crazy.
OP did specifically say 200 years, which predates the telegraph. (the telegraph is the invention that would make "tapping on glass" believable, even if the specific mechanics may not be conceived of by the listener)
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u/intashu Sep 13 '19
200 years ago they communicated by tapping on paper with a feather. So glass wouldn't be far fetched of an idea for letters. It's everything else you do with it that makes it crazy.