Feng Shui was first used about 3000 years ago. At that time it was known as Kan Yu. It is the study of landforms by using yin and yang principles and the 5 elements i.e. wood, water, metal, earth and fire. This is known as San He Feng Shui.
San Yuan, a later system of Feng Shui was thought to make its presence at the end of the Tang Dynasty (618AD – 907AD) and involves time and space dimensions. San Yuan also includes Dragon Gate Eight Formations, Time and Space 64 Hexagrams, Flying Stars and Eight Mansions.