For putting up a new building, one or more human heads in the foundation could increase its spiritual potency.The victims of headhunting had to be selected from tribes with which the hunting tribe already had a feud, so there would be justification. The practices of headhunting followed certain rules of conduct.These days head-hunting can no longer take place, due to the Dayaks’ conversion to other religions in colonial times, and also Indonesian laws.The practice has been rumored to occur on rare occasions since then. In past times, it was also known in certain other Indonesian cultures.In traditional Dayak religion, the universe took form in all its diversity as the result of a primeval sacrifice. Since that time, rituals bring together the various opposed parts of the universe within a single harmonious, spiritual framework: male and female, social classes, up river and down river, life and death, and so forth.Among the Dayak, as with the Toraja, a death in the community is marked by a great feast.So, this series of lectures has highlighted the persistence of adat in relation to the introduction of religions from elsewhere in the world.And it is clear that in a traditional setting, rituals bind people to their communities and structure their lives within a calendar of activities throughout the year.Rituals are exceedingly diverse, just as the cultures of the many islands in Indonesia are diverse.