This is a simple solution for bookshelves. We often encounter a situation whereby books don’t stay upright in a bookshelf that is not packed from end to end. This is the problem that the Five Degree Bookshelf aims to solve. Without changing the original shape of the bookshelf, a small angle is added to the horizontal plane of the shelf. The books will keep themselves stable due to the gravitational law. Meanwhile, Five Degree Bookshelf is a modular system with a simple structure that is easy to be disassemble and transport. It also allows users to assemble the layout according to their personal preferences, which increases interaction between people and products.