Why did traditional Japanese tea rooms have very low doorways?

Traditional Japanese tea rooms, known as cha-shitsu, feature very low doorways—often referred to as "kneeling-in" entrances—primarily to instill a sense of humility in all who enter.12

By requiring guests to bow or crawl to pass through the small opening, the architecture serves as a physical reminder to leave behind the status and concerns of the outside world. This design is consistent with the principles of the tea ceremony, which emphasizes harmony, respect, and the aesthetic of wabi-cha—a style defined by simplicity and an absence of ornament. The act of entering through such a restricted space acts as a symbolic transition, helping participants focus on the tranquil, meditative atmosphere of the ceremony.12