Described by its architect as a “very quiet participant within the forest,” the Audain Art Museum planned for Whistler, B.C., has grown to double the size originally announced. On Tuesday, philanthropist Michael Audain revealed the design for a 55,000-square-foot museum – up from the 27,000 square feet first proposed last fall, and the 39,000-square-foot facility later approved by the Resort Municipality of Whistler.