What Exactly Is Calder Gardens?

What Exactly Is Calder Gardens?

PHILADELPHIA — It’s “not a museum,” and, according to its architects, it’s “not a building.” But this cool subterranean lair on the historic Benjamin Franklin Parkway now houses a shifting collection of floating mobiles and grand “stabiles” by the modernist master Alexander Calder. Welcome to Calder Gardens. In stark contrast to the soaring staircase of the recently rebranded Philadelphia Art Museum, the newest addition to Philadelphia’s “Museum…