Before machines automated the process of printing and binding books, but after books were made with handwritten pages or large, hand-carved wood blocks, books were typeset with small metal pieces, printed, and bound/sewn by hand. Today, it’s an art form. This video demonstrates the process.
Related DIY at DesignSponge: Bookbinding 101: The five hole pamphlet stitch.
Related watching on this site: Upside Down, Left To Right: A Letterpress Film, PBS Off Book series: Typography, and Printing with a 2000lb cast-iron Kluge Letterpress machine.