at his death in 1879 his pupil paul boeswillwald, and later the architect nodet continued the rehabilitation of carcassonne. the restoration was strongly criticized during viollet-le-duc's lifetime because he made the error of using slates and restoring the roofs as pointed cones, where local practice was traditionally of tile roofing and low slopes, as in this region snow was very seldom. but today viollet-le-duc's work at carcassonne is thought to be a work of genius, even if it is not exactly the same as it was.