Yes, of course, a boy has only two shoulders over which peers can gape, but a crowd of young Kabuki actors backstage at the Edo-Tokyo Museum formed a dehiscent triad behind a handheld video game — showing just how bright and fluid pixels illuminate a child's face and mind. The device has no identification; the expressions require none. On our left, desire and the right, wonder. In the center, that unforgettable, inexplicable rapture of fixed captivation.