The practice works largely because of the psychological effect of colors and symbols. Blue is strongly associated with calmness, stability, and mental clarity. When someone sees a blue container in their living space, it subconsciously signals peace and composure. Salt, on the other hand, has been used for centuries in many cultures to represent cleansing and protection. Putting salt ... https://www.youtube.com/watch?v=i9TmSq4MPSQ