The four mythical beasts in ancient China are indeed related to the direction, that is, the green dragon in the east, the white tiger in the west, the red bird in the south, the black basalt in the north, and the yellow dragon in the middle. This is established by the Five Elements Yin and Yang experts for the way of heaven. Unchanging.
It has nothing to do with house Feng Shui. House Feng Shui only talks about the left green dragon, right white tiger, front vermilion bird, and back Xuanwu. It is based on the left and right sides of the house or tomb, and can be changed according to the orientation of the house.
Of course, the palace must comply with both Feng Shui and Heaven. This is a special case.
Supplement: Feng Shui orientation and the Yin and Yang orientation of the Five Elements are not a systematic concept. In ancient times, the positioning was relatively strict. Heaven, earth and man must be harmonious and unified, so the two concepts are often viewed together. Nowadays, we are no longer demanding about heaven and earth, but only seek humanity, so we have basically given up on the yin and yang orientation of the five elements. Therefore, it is not a bad idea to separate the two systems. Note: Macroscopic concepts cannot explain microscopic systems.
To add: You are right. The directions of heaven and earth remain unchanged, southeast, southeast, and northwest, so the directions of the four beasts remain unchanged. For a single house, we don’t talk about the southeast, northwest, and southeast, but only the front, back, left, and right, and the four beasts return to their places. This is constant for the house no matter which direction the door faces. In other words, the direction of heaven and earth and the four phases of a house are not the same thing. They are just protected by the four beasts.
Today’s house building no longer cares about Feng Shui, so it is equivalent to abandoning the world and only seeking people. Therefore, the current house can only demand that the four images of the house itself be returned to their positions, which is no longer consistent with the four images of heaven and earth, so it must be explained. Only the four images of the house can be used instead of the four images of heaven and earth. This was basically impossible in ancient times, because people cannot violate heaven and earth. Modern people have conquered heaven, and there is nothing they can do.