It is constructed of eco-friendly bamboo ply.

This Wall Slant Shelf is the focus of any room! Anytime people walk in if it's the first thing they see they always lean to check if it's the shelf or them that's slanted! It's funny and eco-friendly!

Another great bookshelf, made from eco-friendly bamboo. From the site: "Constructed of eco-friendly bamboo ply, the Wall Slant shelf is part of the forward-thinking furniture line offered by Rhubarb Decor. It boasts useful spaces for books to lean naturally, reducing fatigue on their spines." Smart! (via Alice_Moon)