The Four Directions, East, South, West and North, represent the four seasons, Spring, Summer, Autumn and Winter.
Together with the Centre they form the five cardinal points.
The Four Directions have been represented at least since the second century BC, by four celestial animals, the Dragon for the East, the Bird for the South, the Tiger for the West, and the Tortoise for the North.
Each animal has its own colour : the Dragon is the Green of Spring, the Bird the red of Fire, the Tiger of Autumn the glittering white of metal, and the Tortoise Black, for night, or water.
The four celestial animals are also the names of the four divisions of the sky.
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