Solution: Put a copper gourd (preferably with a light) or the Wenchang Tower in Jishi. Gourd can contain the impulsive gas field in the house; Wenchang Tower can suppress the gas field in the house. Wenchang Tower is the most commonly used instrument, which is conducive to reading, fame and career. Children can put this device on the bed; Adults put it on the workbench; Scholars put them in the bookcase, which is conducive to the agility of writing. In ancient times, there was a saying that the river demon in Baota Town, faced with fierce water and roads, used Wenchang Tower to treat the town, which could turn disaster into joy.