“For decades now, the Walker has been one of the liveliest museums in the country, an institution that maintained a strong independent voice despite its ties to the mainstream art world. When the museum hired the Swiss team of Jacques Herzog and Pierre de Meuron to design a $67 million expansion and renovation of its existing 1970’s-era building, it seemed like a match made in heaven. The architects had built their reputations on museum projects like London’s Tate Modern and the Goetz Collection in Munich, known for their meticulously refined materials and a sense of inner tranquillity. The result is an exhilarating place to view art.