I happen to come across this on Penguin Books page, it is a really nice design, they commented that Figure3 designed it.
You see the video where you see the spine of the books and it slides out, very clever design.
Penguin has always had great designs for their books.
As seen in the video here:
A news article on the store
A world map of Authors, found it very interesting
I looked more at Figure3’s website, and they have a lot of interesting projects.