No, no, they didn’t turn the photo upside down here, it’s the whole bookshelf that’s inverted!
Great idea, isn’t it?
By the way, when writing about recycling books I put a link to an invisible bookshelf, you may like it still better (somehow I can’t decide ;-)).
Links:
Inverted Bookshelf
Invisible Book Shelf
Here at unikatissima:
Recycle books