In ancient China, kitchens were an integral part of the household, and some incorporated a built-in steam room known as a 'zhengshi.' These steam rooms were used for cooking, as well as for medicinal purposes. The Chinese believed that steam could enhance the flavors of food and promote good health. The zhengshi in ancient Chinese kitchens were typically made of wood or stone and featured a system that generated steam. The steam would then be directed into the cooking area, allowing for the preparation of steamed dishes. This method of cooking was popular in ancient China and is still widely used today. The steam rooms also served as a place for relaxation and rejuvenation, with the steam believed to have therapeutic properties. People would often spend time in the steam room to cleanse their bodies and promote overall well-being.