Who, on seeing a Parisian apartment house, has never thought of it as indestructible? A bomb, a fire, an earthquake could certainly bring it down, but what else? In the eyes of an individual, of a family, or even a dynasty, a town, street, or house seems unchangeable, untouchable by time, by the ups and downs of human life, to such an extent that we believe we can compare and contrast the fragility of our condition to the invulnerability of stone.