The Pavement of Siena Cathedral is a unique, surprising work that has no parallel elsewhere. For centuries it has aroused - together with the veneration of the Sienese people - the enthusiasm of visitors from all over the world. The uniqueness is given first of all by the quality of the technique used - the commesso. But the Pavement not only gives an aesthetic impression, but it is also a marble book to be read in a symbolic and spiritual key: the Cathedral as an open book. This new, accurate, detailed and richly illustrated guidebook will lead the visitor to fully appreciate the beauty of marble inlays and their meaning. It will also be of great help for scholars and aficionados of Sienese art.