Allan Kronzek, a professional magician who lives in Sag Harbor, has pulled off a wonderful trick – writing a how-to book for grandparents that’s designed to connect them with their grandkids. Called “Grandpa Magic,” but intended also for Grandmas, the book declares that its 116 amazing brain teasers, perplexing puzzles and simple stunts will wow kids of all ages. And lure them away from their digital devices for a while. Kronzek hopes to engage kids in an imaginative world full of mystery, secrecy and surprise. Not to mention introducing or reinforcing motor and cognitive skills, along with the fun. “Mentoring a kid in magic is different from sharing any other pursuit,” he says. Magic is more than a collection of tricks and secrets. “It’s a rich, creative art with affinities to acting, writing, psychology, science, and math – all areas where the generations might connect.” It’s not just what Kronzek presents here, though, that’s impressive – from easy tricks for the 6 and under set,