WOODSTOCK, New York — When I arrived at Keltie Ferris’s studio last month, he invited me first to see the home he shares with his wife and their child. “It’s important to situate yourself,” he says, allowing me a glimpse into the domestic side of his life, before we focus on the work. Then we walk back across the field toward the studio, and a loud scratching noise catches his attention. Ferris points toward a massive black bear clambering up th…