As it is popular as a current tea room, the idea of a square door called nijiriguchi (crawling entrance) was developed by Rikyu, and before that, people entered a tea room by shoji (a paper sliding door) situated between the tea room and engawa (a veranda or terrace surrounding the house in Japanese architecture).
現在の茶室でよく見られる躙り口も利休の考案であり、彼以前には縁側から障子を開けて茶席に入っていた。