"Every moment of the day the skin is radically different, reflecting the changeability of modern art," Halbreich says.
The expansion doubles the amount of gallery space, and houses several new facilities. It includes a retail centre on the main floor, a restaurant on the second floor, a 279m² events space on the fifth floor, and a 385-seat multi-disciplinary performing arts theatre on the third and fourth floors. The double-storey glass walkway includes galleries and social spaces with offices above, as well as a new rooftop terrace.
Halbreich says the new tower has two different window treatments large windows let people walking past see in; smaller windows are for those inside to look out, carefully placed so as to focus their attention on something special.
The transparent nature of the new tower and the glass walkway are partly a reaction to the solid brick structure of the Barnes tower. Halbreich says the old building had very few apertures, and they wanted the new building to have a more transparent nature.
Christine Binswanger, partner in charge from Herzog & de Meuron for the Walker Art Center project, says they did incorporate several elements from the old building into the new wing.
"Edward Barnes' gallery concept, along with his choice of materials, especially the terrazzo floors, has clearly stood the test of time and ensured remarkable curatorial freedom," she says.
Galleries have a similar feel in the two parts of the building, but one major change was to have no reveal between the floor and the wall. Designed to increase air flow, the gap was problematic for curators, and the reveal was usually filled in.