Casa Mil & It has a wavy appearance, high and low roofs, and the whole building is very dynamic like the rough sea. Three wavy walls, balcony railings made of twisted iron bars and panels, and wide windows are very eye-catching. There are many strange chimneys and ventilation ducts on the roof, which are strange but beautiful. In the evening, standing on the rooftop, the view of Gracia Street was incomparable.