The map depicts a reasonably good picture of seven European countries and their connection by six numbered air routes. With the magician's back turned the subject starts in any country and begins his tour by calling out in sequence the numbers of his flights. When he completes his tour to his satisfaction he announces his ending country. The magician can immediately name his starting country and the direct route to return to it.
"A Magic Tour of Europe,"
3, Article 11.
Available at: http://digitalcommons.butler.edu/wordways/vol45/iss3/11