M. H. de Young Memorial Museum

Named for San Francisco newspaperman M. H. de Young, this building is a completely reworked redesign from the original museum, which opened in 1895 as an outgrowth of the California International Exposition of 1894. After the Loma Prieta earthquake in 1989 which completely ravaged the original building's structure, the de Young board began working to fund a restructuring of the building, and the resulting winner of the competition for its redesign in the late 1990's was acclaimed Swiss architects, Jacques Herzog & Pierre de Meuron.

Herzog & de Meuron developed the idea of a variably perforated screen exterior which would mirror the green foliage and forestry of the surrounding Golden Gate Park, San Francisco's central park. The architects worked with Zahner whose engineers and software specialists developed a system which would allow unique perforation and patterned dimples, variably sized and placed throughout the exterior. This included over 8000 unique panels whose collective whole formed the pattern of light through trees - literally. This was the first iteration of the Zahner Interpretive Relational Algorithmic Process, or the ZIRA Process.

Craftsmanship in large buildings is supposed to be dead, killed by Modernist ideology and cost considerations. What this building says is that maybe craftsmanship has a high-tech future after all.

Time Magazine
Aerial view of the de Young Museum in San Francisco, California
Aerial view of the de Young Museum roof.
Inverted Seam roof system and channel design for the de Young Museum roof
Outdoor cafe under the de Young Museum canopy awning

At the time, this mosaic algorithmic process was emerging, but was unheard of in the world of architecture. Zahner hired software developers and engineers to assist in this technological advancement.

The architects came up with a photo taken pointed up through the trees, and in several parts of the museum, light filters through the perforated system of holes, revealing shadows similar in shape and form to those of actual trees. ZIRA technology was developed to streamline this complex series of variable holes in the copper, allowing engineers to run chosen imagery through the algorithmic system, translating it to the thousands of copper plates. 

De young children
Source imagery and installed panel system for the ‘Children’s Entry’ at the de Young Museum.

Above left, the surface of the 'Children's Entry' was created using imagery from a photograph provided by the architects (right). The vantage point looks up into a sky obscured by trees. Similarly, the section of the Museum featuring this surface was initially open, recreating the effect on metal. Since installation, the area has been covered for moisture control.

... A sensual copper skin that will evolve over time.

Sarah Amelar author, Architectural Record.

Architects originally called for a light golden-hued appearance for the Museum.  However, as the intentions evolved, a desire for the Museum to blend and emerge from its forested surroundings like an ancient indigenous structure.

De young surface
Patina transition over time on the de Young Museum

Zahner helped to guide this decision for the client. Understanding how copper alloys weather over time, and understanding the integrity and durability of the material is key to its selection process. Zahner brought the clients into the fold of this knowledge, educating the design team on how over the next few decades, the copper facade and roof would transition from its bright golden red, to a dark brown, to a black, and finally, after a decade or more, it will slowly emerge into earthy greens.

In clean air environments — which San Francisco generally has great air quality — this process can take much longer. Copper oxidizes quickly in polluted areas. In cleaner environments, this process could take twenty to thirty years.