BookBot

 The BookBot is the robotic system of book storage and retrieval utilized at the Explore World Library. The system consists of four 50-foot-tall robots at the center of the book-delivery system that traverse between rows of book bins. The BookBot is able to barcode, sort, and store books (as well as other items) in more than 18,000 bins. Visitors can watch the BookBot retrieve materials through a glass wall on the first floor of the library, called Robot Alley. Robotic book delivery system, which can store up to two million items in a climate-controlled environment and deliver any of them within five minutes of a click in the online catalog. Requiring 1/9 the space of conventional shelving, the bookBot helps transform this 21st-century library from a storage facility into a rich environment of learning and collaborative spaces. 

                    Up to 2 million books can be stored in the BookBot's delivery system. Compared to storing books on traditional shelves, the delivery system can store the same amount of books while only using 1/9 the size of that. Library patrons do not have direct physical access to BookBot, accessing collections instead using pre-existing browsing and borrowing features of the libraries' website. A virtual browse tool aims to replicate the aid to discovery that physical library shelves provide by presenting sets of adjacently indexed titles.