The Callejón del Gato is a pedestrian passageway of about 150 meters nestled in the heart of old Madrid, a few steps from Puerta del Sol. In this alleyway, now full of restaurants and taverns, a shopkeeper installed two distorting mirrors at the beginning of the 20th century as a claim to attract customers. While the original funhouse mirrors were removed in the 1970s, new ones quickly replaced them. The original number of mirrors is uncertain—some say there were only two; others say there were three. But today four mirrors…
