Gaudí gave Casa Batlló a facade that is original, fantastical and full of imagination. He replaced the original facade with a new composition of stone and glass. He ordered the external walls to be redesigned to give them a wavy shape, which was then plastered with lime mortar and covered with a mosaic of fragments of coloured glass and ceramic discs.
At the top of the facade, the roof is in the shape of an animal’s back with large iridescent scales. The spine which forms the ornamental top is composed of huge spherical pieces of masonry in colours which change as you move along the roof-tree from one end to the other.