Very nice vintage paperback Color photos Pocket Books, 1959, 368 pages Aku-Aku, the Secret of Easter Island describes Thor Heyerdahl's research at Rano Raraku & Anakena on their many giant stone statues. The book & later film made a major contribution to awareness, outside anthropological & archeological communities, of both the island & the statues. Much of his evidence has now been refuted by archeologists. His methods have been criticised. Paul Bahn wrote: "he relied on the selective use of evidence, which resulted in a misleading conclusion". Heyerdahl is most controversially associated with an attempt to revive the theory that the islanders' stone carving technology came from S. America. He argued that as well as being settled by Polynesians, Easter Island was settled by people from Peru, an area described as "more culturally developed". "Aku-aku" refers to moving a tall, flat bottomed object by swiveling it alternatively on its corners in a walking fashion. Heyerdahl theorised the Easter Island Moai (statues) were moved in this fashion, & tested this on a small Moai--tho the test was abandoned after the Moai's base was damaged. He also asserts that for the islanders, Aku Aku means a "spiritual guide."