Divination is the focus of many Shinto rituals, with various forms of divination used by its practitioners, some introduced from China. Among the ancient forms of divination found in Japan are "rokuboku" and "kiboku". Several forms of divination entailing archery are also practiced in Shintō, known as "yabusame", "omato-shinji", and "mato-i". Kitagawa stated that there could be "no doubt" that various types of "shamanic diviners" played a role in early Japanese religion. A form of divination previously common in Japan was "bokusen" or "uranai", which often used tortoise shells; it is still used in some places.