Camera in hand, Martha Stewart was zooming around Metropolitan Pavilion looking for ideas, though she was open to picking up antiques that struck her fancy. “I’m not a collector. I’m an accumulator,” she said. “A collector has a modus operandi, and I just accumulate things I like.” Does she need more stuff, we asked, innocently. “Of course! I always need more stuff.” But how does she make room for it all? “I build a house! What a silly question.”