Buddhist geomancy, the art of putting things in the place most likely to attract good fortune. The rules for the placement of water were laid out in the first manual of Japanese gardens, the , in the 11th century. According to the , water should enter the garden from the east or southeast and flow toward the west, because the east is the home of the Green Dragon (), an ancient Chinese divinity adopted in Japan, and the west is the home of the White Tiger, the divinity of the east. Water flowing from east to west will carry away evil, and the owner of the garden will be healthy and have a long life. According to the , another favorable arrangement is for the water to flow from north, which represents water in Buddhist cosmology, to the south, which represents fire, which are opposites (yin and yang) and therefore will bring good luck. The recommends several possible miniature landscapes using lakes and streams: the "ocean style", which features rocks that appear to have been eroded by waves, a sandy beach, and pine trees; the "broad river style", recreating the course of a large river, winding like a serpent; the "marsh pond" style, a large still pond with aquatic plants; the "mountain torrent style", with many rocks and cascades; and the "rose letters" style, an austere landscape with small, low plants, gentle relief and many scattered flat rocks. Traditional Japanese gardens have small islands in the lakes. In sacred temple gardens, there is usually an island which represents Mount Penglai or Mount Hōrai, the traditional home of the Eight Immortals. The describes different kinds of artificial island which can be created in lakes, including the "mountainous island", made up of jagged vertical rocks mixed with pine trees, surrounded by a sandy beach; the "rocky island", composed of "tormented" rocks appearing to have been battered by sea waves, along with small, ancient pine trees with unusual shapes; the "cloud island", made of white sand in the rounded white forms of a cumulus cloud; and the "misty island", a low island of sand, without rocks or trees. A cascade or waterfall is an important element in Japanese gardens, a miniature version of the waterfalls of Japanese mountain streams. The describes seven kinds of cascades. It notes that if possible, a cascade should face toward the moon and should be designed to capture