Local officials held a ribbon-cutting ceremony this morning at Philadelphia’s Calder Gardens, the new sanctuary honoring pathbreaking sculptor Alexander Calder, presaging its opening to the public, which is set for September 21. Designed by Pritzker Prize–winning Swiss architecture firm Herzog & de Meuron and featuring grounds planted by Dutch landscape designer Piet Oudolf, who is responsible for the natural, idyllic look of New York City’s High Line, Calder Gardens was created in collaboration with the Calder Foundation. Unlike the surrounding institutions, however, Calder Gardens will stage no special exhibitions, instead presenting works from the foundation’s vast holdings in an unscheduled rotation alongside those borrowed from other sources. “On the surface, my grandfather pushed beyond established norms by collapsing mass and setting sculpture in motion,” said Calder Foundation president Alexander S. C. Rower, the artist’s grandson, in a statement. Calder Gardens does not so much present a story as it offers an opportunity to activate this challenging notion.