How many old photo albums lying around houses hold pictures taken on rooftops? Grandparents or parents would climb up there with those cameras that had limited technology (they were called "portrait machines"), searching for the light that was lacking in the apartment so the photo wouldn't come out dark, and a simple background that the street couldn't provide. I suppose they must have looked for their own horizon reference point in each location. In Barcelona, ​​it was clear: the Sagrada Família, with those first four bare towers of the Nativity façade on Sardenya Street, which were the image of the city for almost forty years. The image was so fixed that for many Barcelonans, those four spires were enough.