In the age of smartphones and smartglasses, we might feel blasé about a camera hidden in a hollowed-out hardcover book or a carton of Marlboros. As clunky as they may seem now, these objects were novelties used by covert intelligence operatives in the middle of the twentieth century. More impressive might be a ring camera, similar to the one that appears in the 1985 James Bond flick, A View to a Kill.