That the shelves have no persistent order doesn’t mean they have no order. Rather, works are reshelved by users in the clusters the users have created for their research. All the items have RFID tags in them, and the shelves are automatically scanned so that the library can always tell users where items are located.
As a result, if you look up a particular item, you will see it surrounded by works that some other user thought were related to it in some way. This creates a richer browsing experience because it is shaped and reshaped by how its community of users sees the items’ inter-relationships.
I love everything about this.