The reasons for these changes is still unclear, but it is believed that it may have resulted from a third wave of migrants from Island Southeast Asia. Comparisons with other architectural traditions makes it likely that this third migration wave were again from the Philippines, or from eastern Indonesia (either Sulawesi or Sumba), all of which have a tradition of raised buildings with capstones. Interestingly, the word "haligi" ("pillar") is also used in various languages throughout the Philippines; while the Chamorro word "guma" ("house") closely resembles the Sumba word "uma".