Antoni Gaudí took care of every detail of his buildings, and was innovative even in the less showy parts. After months of work, those responsible for Casa Batlló have restored the unusual black color of the rear façade, which in the 1930s was covered by a cream-colored paint that had become etched in the collective memory. "We have recovered an image of the façade, which, if not from 1906, is the closest," says Xavier Villanueva, the architect who has led the restoration of Casa Batlló for more than twenty years. "This is the first time that the façade has been fully restored, as stipulated in the master plan we drew up about ten years ago. We have done it with scientific criteria and thanks to an extensive, truly extensive, documentary database," says the architect. The snail shell and the white lead color of the balcony railings have also been restored.