Austronesian people form the majority of the modern population. They may have arrived in Indonesia around 2000 BCE and are thought to have originated in Taiwan. Dong Son culture spread to Indonesia bringing with it techniques of wet-field rice cultivation, ritual buffalo sacrifice, bronze casting, megalithic practises, and ikat weaving methods. Some of these practices remain in areas including the Batak areas of Sumatra, Toraja in Sulawesi, and several islands in Nusa Tenggara. Early Indonesians were animists who honoured the spirits of the dead believing their souls or life force could still help the living.