Did yoga exist before the pants? Did yoginis in ancient times also covet their era’s equivalent of Lululemon? And what is the Sanskrit word for “Spandex”? None of these questions will be answered in the Smithsonian’s new exhibition at the Sackler Gallery, “Yoga: The Art of Transformation.” But the partially crowd-funded display of more than 120 works spanning the third century to the 20th will give viewers a vibrant sense of yoga’s deep philosophical foundations. Sculpture, paintings, manuscripts, photographs, and Thomas Edison’s 1906 film Hindoo Fakir, the first movie about India, define the exhibit; yoga pants do not.