The Forum building in Barcelona is considered an icon of the new city, with a triangular shape measuring 180 meters per side and 25 meters tall, constructed around an auditorium that seats 3,200 people. The document also provides biographical information about the architects Jacques Herzog and Pierre de Meuron, who studied in Zurich and formed a company in 1978, designing notable buildings like the Tate Modern in London and sharing credit for their joint works.