The saying, "A single incense stick in front of the door, and all the family's wealth will be squandered," though originating from rural areas, is rooted in the principles of traditional Feng Shui. The "single incense stick" doesn't refer to incense offered to deities, but rather to a long, thin, upright object like a chimney, utility pole, or withered tree standing directly in front of the door, resembling burning incense. This arrangement is considered extremely inauspicious in Feng Shui, bringing financial ruin and harm to the family. This is not unfounded, and ancient texts provide ample evidence. For example, the *Ten Books on Yang Houses* states, "A house... should not be located where it faces a direct clash." It also says, "A road that faces directly at the entrance is called an arrow, which brings injury and financial loss." The taboo against "direct clashes" and "road arrows" is the same principle as the "single incense stick" analogy. The main entrance is the throat of a house, the key to receiving Qi (energy), hence the term "Qi mouth." The *Huangdi Zhaijing* states, "A dwelling takes its terrain as its body, springs as its blood vessels, land as its skin and flesh, vegetation as its hair, buildings as its clothing, and doors as its crown and sash." If the door is subjected to negative influences, it is like an incomplete crown and sash, with the vital energy (qi) damaged. Specifically, this type of negative influence can be categorized as "spear sha" or "piercing heart sha." If the incense stick is sharp and has a "fire" shape, it is considered "fire star sha." The *Zhaijing* also says, "A straight road is ruthless, causing financial loss and injury." This ruthless impact causes the energy flow to pass swiftly like an arrow piercing the heart, unable to circulate and gather within the dwelling. If vital energy does not gather, wealth is difficult to retain. The *Yangzhai Shishu* also warns, "For any dwelling… a chimney like a pen indicates gradual decline in family wealth." This is the precise interpretation of "a stick of incense in front of the door." A straight chimney, like a pen or incense stick, signifies a decline in the family's fortunes and a lack of connection with wealth. Furthermore, this saying aligns with the principles of Yin and Yang and the Five Elements. Incense burns in the fire element. If a doorway is directly exposed to the fire-shaped energy of incense, the excessive fire energy will deplete the metal element. In the Five Elements theory, metal represents wealth; when metal energy is suppressed, wealth is hindered. Furthermore, incense is traditionally associated with sacrifices, implying consumption and offering. The Book of Rites states, "Sacrifices should be performed in designated areas, and one should not overstep one's bounds." A home is not a place for sacrifices. If incense is constantly placed in front of the door, it's as if the house has become a shrine, receiving sacrifices day and night. The family's fortune, like the incense, will gradually dissipate, eventually leading to ruin. From an environmental and psychological perspective, being directly exposed to the fire-shaped energy of incense will cause unease and subconscious anxiety. As the saying goes, "suspicion breeds ghosts," leading to erratic behavior and biased decisions, ultimately resulting in economic hardship. Though intangible, its power is immense. The saying "a stick of incense in front of the door" is a crystallization of ancient wisdom, blending geographical features, the interaction of the Five Elements, psychological perception, and life experience. Although it has not entered the halls of modern science, its pursuit of harmony in the living environment and balance of energy, and its yearning for "gathering and storing energy," are still worthy of deep reflection by people today. Therefore, to avoid such negative energy, one may set up a screen or plant trees to block it, not only for the sake of auspicious feng shui, but also for peace of mind and tranquility of the home.