The painters, then, inspired by the work of the architects, discovered how much dignity they could give to their own compositions by introducing architectural features. Sometimes they would introduce columns, or a flight of steps or a balustrade, sometimes a whole building; or represent the figures grouped in a street or square, surrounded by buildings, or often inside a building, standing under a vaulted ceiling. These are only a few of the architectural features, so freely used by the Italian painters. Let us study their value to the composition.