There should be no water behind the chair, not in front of the mirror, and not on the back of the chair. The back of the chair must be backed, which is the so-called backer. If the chair is facing the window or the door has a passage, it will make the back of the chair look empty and insecure. The back of the chair corresponds to the owner's backer. If it is not properly placed, it will imply that there is no backer at home, which will affect the future.
You can't put a fish tank in front of or behind the chair, and these places can't be placed behind the chair. So generally speaking, the space behind the chair is filled with green plants, so choose some big green plants. The green plants are too small to serve as chairs. You have to use some big green plants and lush trees, which means that the owner has many backers and many people help.
The door can't face the chair directly, because the door means outward. If the door is facing the chair, the owner's backer will be washed away by the door and blown away by the wind. Without the help of noble people, the master's future is bleak, everything goes wrong and people are worried. Therefore, the door must not face the back of the chair, so that the future of the owner can be guaranteed. Although these are superstitions, they can also be believed.