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Also, a machine-learning model of the script was created to restore the illegible and damaged texts, paving the way for further research.

"They were tasked with delivering 17 million pieces of mail that had been just thrown into hangers, that had been mouldy and a lot of the names on the letters were illegible," he said.

The inscription on her headstone had become so illegible that, prompted by a local campaign, masonry restorers were brought in to spruce it up.

There is an illegible history that you only really learn growing up in a place.

For example, personal information on a ticket stub could be replaced with illegible letters, or a private building exchanged for a fake building or other landscape features.