English: Plans of houses in Pompeii: the House of the Figured Capitals and the House of the Tragic Poet. "In the plan of a family house sw distinguish three kinds of atriums. I, the Tuscan without supports; 2, the one of four columns, and 3, the Corinthian (Atrium tuscanum, Atrium tetrastylum, Atrium corinthium. All of them were compluviati, that is to say, the water that fell on the roofs was conducted and gathered inside. To the "compluvium", that is to say the opening of the roof, corresponding to the "impluvium" on the floor, according to the size of the aforementioned opening. The peristyle, although more extended in the surface of the floor, presents for this reason the lesser development in height. In the peristyle they had to protect themselves from the sun and for this reason they had to place the lowest roof. The atrium and the peristyle are, from the architectural point of view, the elements of the building that have experienced the greatest increase in artistic expression."