Exaptation

Where Good Ideas Come From: The Natural History of Innovation by Steven Johnson.

For Johannes Gutenberg, it was the ubiquity of winemakers nearby that helped lead to the invention of the printing press around 1440 CE: "Pliny  Elder (23-79 CE) ... tells the story of a device winemakers had recently invented, a new kind of press that employed a screw to 'concentrate pressure upon broad planks placed over the grapes, which are covered also with heavy weights above.' There is some debate among scholars over whether Pliny may have been rooting for the home team in attributing the invention to his compatriots, since evidence for the use of screw presses in producing wines and olive oils dates back several centuries, to the Greeks. But whatever the exact date of its origin, the practical utility of the screw press, unlike so many great ideas from the Greco-Roman period, ensured that it survived intact through the Dark Ages.