Speaking of sorting.
This little 'baby' sorts all the books that are braught back to the public library where I work. This is the exit on the childrens department. The library has 6 floors with books and on every floor is an exit like this.
All books are returned by the customers on one place and this robot sorts them, transports them to the correct floor and pushes it out of the elevator-thingy on the right shelve. All we have to do is put them in a cart and place them on the proper shelf.
Quite impressive isn't it? :D