A pivotal figure in popularizing theories of interior design to the middle class was the architect Owen Jones, one of the most influential design theorists of the nineteenth century. Jones' first project was his most important—in 1851, he was responsible for not only the decoration of Joseph Paxton’s gigantic Crystal Palace for the Great Exhibition but also the arrangement of the exhibits within. He chose a controversial palette of red, yellow, and blue for the interior ironwork and, despite initial negative publicity in the newspapers, was eventually unveiled by Queen Victoria to much critical acclaim. His most significant publication was "The Grammar of Ornament" (1856), in which Jones formulated 37 key principles of interior design and decoration.