That "maze" bookcase is built by German product designer René Mueller and forester Nina Griesshammer of Woodloops.
Their products are "green" (built out of wood certified by the Forest Stewardship Council) - but even if you don't care about all that, it's still easy to marvel at the craftsmanship and wonderful design.
Inhabitat blog has more: Link
Book shelves should display your books so that they look appealing to read. I would love to have a bookshelf like this!