Ortuzar is pleased to present “Claire Falkenstein: San Francisco, Paris, Rome,” the gallery’s debut exhibition of work by the American artist whose gates of tangled iron, set with chunks of Murano glass, have welcomed visitors to the Peggy Guggenheim Collection in Venice since 1961. The exhibition follows Falkenstein from her formative decades in San Francisco to the avant-garde centers of postwar Paris and Rome, assembling some twenty works—several unseen since the 1950s—in copper, glass…