Gothic at the technical level Gothic architecture is characterized by the ribbed vault. These features were all present in a number of earlier, Romanesque buildings, and one of the major achievements was to use this engineering expertise to create major buildings that became, in succession, broader and taller. Skilled use of the pointed arch and the ribbed vault made it possible to cover far more elaborate and complicated . Skilled use of buttressing, especially of flying buttresses, made it possible to build taller buildings and to open up the intervening wall spaces to create larger windows. One of the earliest buildings in which these techniques were introduced in highly sophisticated architectural was the abbey of Saint-Denis Paris(G. A. Gothic Art And Architecture).