One of Gaudí's largest and most striking works is the Casa Batlló (1904-1906). Commissioned by Josep Batlló i Casanovas to renovate an existing building erected in 1875 by Emili Sala Cortés, Gaudí focused on the façade, the main floor, the patio and the roof, and built a fifth floor for the staff. For this project he was assisted by his aides Domènec Sugrañes, Joan Rubió and Josep Canaleta. The façade is of Montjuïc sandstone cut to create warped ruled surfaces; the columns are bone shaped with vegetable decoration. Gaudí kept the rectangular shape of the old building's balconies-with iron railings in the shape of masks-giving the rest of the façade an ascending undulating form. He also faced the facade with ceramic fragments of various colours ("trencadís"), which Gaudí obtained from the waste material of the Pelegrí glass works. The interior courtyard is roofed by a skylight supported by an iron structure in the shape of a double T, which rests on a series of catenary aches. The helicoidal chimneys are a notable feature of the roof, topped with conical caps, covered in clear glass in the centre and ceramics at the top, and surmounted by clear glass balls filled with sand of different colours. The façade culminates in catenary vaults covered with two layers of brick and faced with glazed ceramic tiles in the form of scales (in shades of yellow, green and blue), which resemble a dragon's back; on the left side is a cylindrical turret with anagrams of Jesus, Mary and Joseph, and with Gaudi's four-armed cross.
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