Equation Bookshelf is an atypical and fun way to organize your books and not only. The main idea is quite simple. Marcos Breder and his design team from Brazilian company Estudio Breder created this bookshelf to divide things in priority order; a translation of the mathematical equation in home décor. So, put the most important book or any other object, such as a flowerpot or a portrait, between parentheses and set others between square brackets and braces.
Via estudio breder blog.