A skinny yellow crane barrels down the track and rolls by what looks like a gigantic filing cabinet. It stops at the appropriate box, and a robotic arm pulls the bin out of the metal rack. The crane slides to the front, slamming to a halt in front of the librarian, and lowers the box to the workstation.
The bins are separated into six sections, with each section holding between 10 and 25 books. A computer has stored the location of each book by section. The librarian retrieves the information, then manually picks up the book.
Boxes remain at the workstation, and when a different book is returned, it is re-scanned and placed into that open box.