Barcelona has always been characterized by a special sensitivity and respect towards its past (cultural, historical, architectural…), as well as a constant investment in the future and vanguard projects. Las Arenas Bullring is a clear example of this situation, uniting architectural historical reverence with technological innovation. In spite of the fact that the former bullring, in disuse since 1989 and with a neo-mudéjar style, didn’t actually have high architectural value, it was clear that, being poised in such an impressive location for more than a century, this site was really in the minds of every citizen, and its symbolic value lead to a suitable preservation. That’s why the architectural answer, already from the first outlines, was orientated towards its maintenance as a second skin of the new building. Nevertheless, such preservation met great technical complexity: first, an evident physical deterioration; second, a strange height, four meters above the nearby streets. The technical effort was worth it, in the end to present a strong, atypical cylindrical form.