A number of years later, while on a lecture tour of Japan, von Hoffman came upon the idea of visiting Taiwan, which was then called Formosa and under Japanese control, and had wild areas not heretofore explored or photographed. Entry was not encouraged by the government, and in fact no foreigners were permitted. This made it all the more appealing to him, and by trickery he secured a ticket for passage on a government boat, with professors en route there to service the small educational system the Japanese maintained on the island. His exploration of this region permitted him to record on film some of the rites of the tribes of headhunters still living in the remote mountain areas. This seven-month effort produced a remarkable film shown at the Explorers Club. The visit also permitted him to secure a collection of treasured artifacts relating to the lives of these people and produced a lecture series on the subject.