 Prasetyo (2006) suggests that the megalithic traditions are not originally Austronesian, but rather innovations acquired through trade with India and China, but this has little to no evidence in the intervening regions in Thailand, Vietnam, and the Philippines.The Austronesian Painting Traditions (APT) are the most common types of rock art in Island Southeast Asia.They consist of scenes and pictograms typically found in rock shelters and caves near coastal areas.