Built at the dawn of the 20th century, the Glasgow School of Art is the major work of the only British artist considered a precursor of modernism, Charles Rennie Mackintosh. The most eminent exponent of the "Glasgow Style", the equivalent of Parisian Art Nouveau, Mackintosh devoted over a decade to the realization of what is unquestionably his most innovative architectural project. Ten years of work without the architect ever setting foot on site.