What is the saying in Feng Shui about the son made of iron?

You may be talking about the anvil while the iron is hot. Anvil is a two-way ballast, which can control energy and evil. In other words, it can not only benefit people, but also harm them. The main function is to subdue obstinacy, resolve disputes, or stir up right and wrong and create contradictions. For the benefit of people, it is generally placed indoors and hidden outside; It's used to harm people. It's all hidden. The specific placement depends on the layout of the house, the environment outside the house, the location and so on. If it is a frequently used chopping block, it can be arranged with a complete set of blacksmith furnace equipment, or it can be discussed with general tools.