CasA MIL &4; (1) was built between 1906 and 1912 on Passeig de Gr &4; cia, an extension of Eixample in Barcelona, Spain. The vault of the Mira House, which takes the shape of parabola or catenary, is the last private residence designed by Gaudi. It covers an area of 1,323 square meters, has 33 balconies, 150 windows, 3 daylighting atriums (2 large atriums, 1 small patio), 6-storey residence, 1-storey top floor (attic), 1 underground parking lot, 3 doors and 2 main entrances. Pere Mil &4, a wealthy man, was invited by Gaudi to design CASA BATLL&3, his home for Mr. Bart, in order to marry Roser Segimon, a wealthy widow. The Mira House is the last private house designed by Gaudi. The wavy appearance is made of white stone walls, balcony railings made of twisted iron bars and slabs, and wide windows, which can give people imagination. The roof of Mira Apartment is high and low, and the whole building, like the rough sea, is very dynamic. The roof is a chimney and ventilation duct made of strange sudden objects. The Mira Apartment is weird, even absurd, both inside and outside. It is still considered by many to be the most representative and original building of all modern buildings, and one of the most important buildings in the world in the twentieth century. None of the buildings are right angles, which is also the greatest feature of Gaudi's works, because Gaudi believes that - "straight lines belong to human beings, while curves belong to God. " Design features - "the weight of its own building is entirely borne by pillars, neither the inner wall nor the outer wall bears the weight of the building itself, the building itself does not have the main wall", so the interior housing can be rebuilt at will, the building will not collapse, and a wider window can be designed to ensure the lighting of each apartment. The top floor is used for adjusting temperature and drying clothes. Follow the earphone guide's instructions, follow the spiral staircase to the balcony, suddenly open, as if to the alien world, there are 30 strange chimneys, 2 vents, and 6 staircases, tower-shaped staircase mouth shape is the largest, spiral staircase inside hidden water tower. Those peculiar chimneys are like alien visitors and fierce soldiers in chess. All in all, they are different and make people crazy enough to take pictures of them. Most people who have visited this building may think that Mira's house is magnificent and overbearing. Others think that the wavy exterior wall is too weird. No matter who likes Gaudi like it, he must not miss Milan's house.