Andrew, on PBS a couple of weeks ago they had a documentary on the creation and transportation of the moai. An archaeologist and former Governor from Chile, who was actually a native of the island followed through on a hunch that the statues "walked" into place. Carving the statues at the quarry on the island, the workers tipped the statues into upright positions, then rocked them back and forth in standing position. It took three groups with ropes working in unison. The demonstration of the actual process was compelling, an absolutely fascinating account.