The origin of the theory of light, darkness, water, fire, wind, thunder, earth and elements.

The theory of four elements (water, flame, atmosphere and land) comes from the ancient Greek philosophy system. Ancient Greek philosophers believed that everything was composed of these four elements, and these four elements corresponded to five kinds of regular cubes (there was another one called ether by the corresponding elements, which was regarded as the elements that constituted the universe and stars, but it was not the mainstream view).

Later, it developed to mean that everything has the difference of density and temperature at the same time (density: atmosphere to land, temperature: flame to water)

Later, it combined the alchemy view and the Bible's world view (or the Bible absorbed these two theories) and created the pentagram theory. The pentagram's five corners refer to spirit, water, flame, atmosphere and land respectively. When the corner symbolizing spirit indicates the power of light up, it indicates darkness down.

(The view that light and darkness constitute the foundation of the world is that human beings have a unified cognition before they have a culture, and it is difficult to explain the earliest source regardless of the existence in that mythological system. Even China's Taoist thought of Yin and Yang can be considered as one of them)

The appearance of the thunder element is unique to Nordic mythology. Strictly speaking, the earliest thunder element should be called the storm element, and then the image of the thunder was gradually strengthened in circulation, and finally the thunder element and the famous thunder element were born.

When China's five elements thought was introduced to Rome in Roman times, some people introduced the Nordic element of thunder, and decomposed the atmosphere in the original Greek four-element system into wind and thunder, and then tried to explain China's five elements thought (thunder corresponds to gold, wind corresponds to wood, and the fairy sword also appeared).

Of course, this five-element theory still can't explain the five elements. So far, many mysteries in the West are based on the four-element theory, supplemented by two elements of light and dark. Only when the chakras (geomantic omen and earth pulse circulation theory) and the five elements are introduced into the East, can the five-element theory (not the pentagram theory) appear.