The creation myths place great importance on purification, ceremonial order, and the masculine. For example, the first child born to Izanagi and Izanami after they attempt a union ceremony is born with no limbs or bones, and the parents discard the child by sending him to sea in a boat. When Izanagi and Izanami ask the older gods why their child was born without bones or limbs, they are told it was because they did not conduct the ceremony properly and that the male must always speak before the female. Once they follow the directions of the older gods correctly, they produce many children, many of whom are the islands of the Japanese Archipelago. Among their children are the Ōyashima, or the eight great islands of Japan — Awaji, Iyo, Oki, Tsukushi, Iki, Tsushima, Sado, and Yamato. The last child that Izanami produces is a fire god, Kagutsuchi (incarnation of fire), whose flames kill her; and Izanagi murders the child in grief-driven anger. The child's corpse creates even more gods. Izanami was then buried on Mount Hiba, at the border of the old provinces of Izumo and Hoki, near modern-day Yasugi of Shimane Prefecture. Scholars of Japanese mythology have noted the incestuous themes of the creation myth as represented in the Kojiki, and the first scholar to write about Izanagi and Izanami as siblings was Oka Masao. Izanami is referred to in the Kojiki as Izanagi's "imo" (meaning both wife or little sister in Japanese) and other scholars dispute that the pair were siblings. Hattori Asake, another scholar, argued that Masao was incorrect because he drew evidence from another myth about humans who had incestuous relations because of a great flood wiping out the rest of the human population. Essentially, Asake said the myth Masao used as evidence was too different to be the origin of the Izanagi and Izanami myth. In the Man'yōshū, Izanami is also referred to as "imo" by the compiler, suggesting that the compiler believed that Izanami was Izanagi's sister. While scholars disagree about the nature of Izanami and Izanagi's relationships, the gods Amaterasu and Susanoo, children of Izanagi, were sibling gods who created children together in a contest preceding Susanoo's desecration of Amaterasu's home which leads to her hiding in a cave. A unique aspect of Japanese mythology is its inclusion of graphic details, with disgusting and horrific images that are considered to be taboo in modern Japanese society, which has many cultural practices associated with purification and cleanliness.