The ( )xn series is a publication by the graphic design studio Ordinary People, focusing on “graphic design we’ve done, are doing, and want to do.” The theme of 《QXN》 is ‘quadrilateral.’ It serves as a spinoff of a section titled ‘So, I need a rectangle with the 2x3 ratio’ from 《8xn》, published in 2017. In this book, the studio members each crafted a sentence containing the word ‘quadrilateral’ and developed their work based on it.