According to "Journey to the West", the Monkey King is born from a strong magic stone that sits atop the Mountain of Flowers and Fruit. This stone is no ordinary stone, however, because it receives the nurture of heaven (yang), which possesses a positive nature, and earth (yin), which possesses a negative nature, and thus is able to produce living beings (according to Taoist philosophies). The stone develops a magic womb, which bursts open one day to produce a stone egg about the size of a ball.