Low energy use was a particular priority for the Triskelion, a 1,300-square-foot moveable pavilion commissioned by the nonprofit arts organization FOR-SITE. Designed by Ogrydziak/Prillinger Architects, San Francisco, the building consists of three shipping containers arranged at 120-degree angles to define a central skylit atrium. Since May 2010 it has been installed at the Presidio, where it was part of the yearlong Presidio Habitats'an exhibition of artist-created animal habitats distributed around one corner of the national park. The pavilion served as a space for the display of sketches and models. Because Presidio officials required that the building be easily demountable and