DIY Archiving Books π
So there's this whole community of people archiving their own books, by building a DIY book scanner.

The main website for building this device is diybookscanner which outlines the process of scanning and digitizing a book, complete with a Pi software suite.
Even Gwern has tweeted about this - not surprising considering he's big into the archiving scene.
Another interesting fact from this talk about DIY book scanning is that the internet archive books uploads a new scanned book every 90 seconds π Great resource for the classics.
The archivist DIY book scanner uses a two-camera setup to scan both pages simulataneously

Worth reading also is the page on optics