Casa Batlló is a building designed by the architect Antoni Gaudí, the greatest representative of Catalan modernism. It is a complete remodeling of a previously existing building on the site, the work of Emilio Sala Cortés. It is located at number 43 Paseo de Gracia in Barcelona, the wide avenue that crosses the Ensanche district (Eixample), in the so-called «Manzana de la Discordia», because it also houses other works of modernist architects: the Amatller house, that adjoins with that of Gaudí, the work of Josep Puig i Cadafalch; Casa Lleó Morera, designed by Lluís Domènech i Montaner; Casa Mulleras, by Enric Sagnier i Villavecchia; and the Casa Josefina Bonet, by Marcel·lià Coquillat. The construction was carried out between 1904 and 1906.
The Casa Batlló is a reflection of Gaudí’s artistic fullness: it belongs to his naturalist stage (first decade of the 20th century), period in which the architect perfected his personal style, inspired by the organic forms of nature, for what he put in practice a whole series of new structural solutions originated in Gaudí’s deep analyzes of regulated geometry. To this the Catalan artist adds a great creative freedom and an imaginative ornamental creation: starting from a certain baroque his works acquire great structural richness, of forms and volumes devoid of rationalist rigidity or of any classic premise.