In ancient Japan, kitchens were designed with functionality and simplicity in mind, and some of them incorporated built-in indoor herb drying racks. These kitchens were equipped with clay pots, bamboo steamers, and other traditional cooking tools. The drying racks were typically made of bamboo or wood, and they were placed near windows or in well-ventilated areas to ensure proper drying. The Japanese valued the use of herbs in their cuisine for their unique flavors, and drying them allowed for easy access and long-term storage.