CasaSugar reports today on the trend of Tetris-inspired bookshelves. They add a great point of interest to any room, with the way the shelves are arranged. This particular bookshelf is also eco-friendly, being made of highly renewable bamboo. Bamboo is a type of grass and grows quickly, but can be used like wood. Bamboo is a perfect material to make things like bookshelves and flooring from, because it is sustainable and is very attractive.