Swami Gimmick

There are some effects in conjuring that convey to the lay audience an impression of "real magic", devoid of any props or apparatus and apparently working by some supernatural means. Amongst these are various categories of mental magic, including predictions. One of the best gimmicks ever created for predictions is the Swami Gimmick, or nail writer. The gimmick allows the performer to write the prediction long after it was supposed to have been made!