As its own name indicates, "On the Build" focuses on the world of architecture, the production of works, those who conceived them and made, from the techniques used, the materials used. Now in the Middle Ages all this was understood quite differently from ours. The building was not only considered a reference in the urban fabric, or the definer of an interior space with a strong symbolic charge, but a coherent whole in which the other constructive elements were joined by the other constructive elements: murals, Sculptures, stained glass, fabrics, pieces of goldwork ... Certain materials could carry implicit meanings that we are no longer able to perceive today; The products of the so-called "greater arts," a hierarchical division completely alien to medieval man, were not necessarily the most appreciated - a rich cloth could arouse impressions and emotions more intense than a sculptured cover could do, towards which, without However, today we would mainly direct our attention-and the principal, in short, could be - and for a long time was - considered much more important than the artist or, at least, be involved in the creation of the work as much as East. The present volume will undoubtedly constitute an important step towards correcting the distorted and simplified topical vision which, as a result of many centuries of contrary propaganda, continues to be of the Middle Ages and has helped to conceal a much richer and more complex reality Of what is thought.