Who can introduce the geomantic omen of the bedroom bookcase?

According to the law of "left green dragon, right white tiger", if the owner is male, the bookcase should be placed on the left side of the wall and the guest chair on the right side of the desk, which is conducive to communication. In addition to the bookcase, the books in the bookcase can not be ignored. You can't stuff the bookshelf too full. You'd better leave some space for the bookcase to ventilate. In fact, it is much more convenient to take books. Finally, the bookcase should not be placed in direct sunlight, which is not suitable for bookcases; From a scientific point of view, the bookcase is placed in direct sunlight, which easily leads to the yellowing and aging of books in the bookcase due to exposure, which is not conducive to the preservation of books.