The Manunggul Jar and the Maitum Jars point to the fact that early man in the Philippines believed in some form of afterlife. These elaborately designed secondary burial jars are also a testament to the artistic skill of the early Filipino. The Manunggul Jar and the Maitum Jars point to the fact that early man in the Philippines believed in some form of afterlife. These elaborately designed secondary burial jars are also a testament to the artistic skill of the early Filipino. or it could be an ancient nursery school and those are the kids projects.