Enough shelves! (at least for a little while)

The client owns an extensive collection of books on the subject of Islamic history, so he requested that we create this building with the maximum capacity for its storage and exhibition.

It's carefully designed to be earthquake-proof, but now that the subject has come up I wonder if it would be good to have a little something to restrain the books from falling out of the shelves if the building is shaken.

Link thanks to haikujaguar.