Herzog and De Meuron: Tate Modern’s architects on their radical new extension

Twenty years ago, Jacques Herzog and Pierre de Meuron converted London’s Bankside power station into a gallery. Now they are about to unveil the Switch House – and reinvent how we view art all over again• What I think about Tate Modern: artists, musicians and critics give their views
Jacques Herzog, the more talkative half of the pair of boyhood friends who founded the architectural practice Herzog & De Meuron, is worried about the world. “The things based on the five