The Illa de la Discňrdia (Block of Discord) hosts Barcelona's most famous group of Modernista buildings and was so named because of the startling visual argument between them. The three most prominent buildings are this one, Casa Lleó Morera by Lluís Domčnech i Montaner (closed to the public); Casa Amatller by Josep Puig i Cadafalch and Casa Batlló by Antoni Gaudí. (I thought it was just more distortion, but another picture indicated that the window on the right is far larger than the others.)

Another view: