The shop is the subject of a Kyōgen farce called "Tsuen" and also appears in Eiji Yoshikawa's epic novel Musashi.
After retiring in his later years, Furukawa adopted the last character of his master's name (政 Masa), and called himself Tsuen Masahisa (通圓政久).
Various historical figures have been recorded as having tea at Tsuen, including the shoguns Ashikaga Yoshimasa, Toyotomi Hideyoshi, and Tokugawa Ieyasu.
This method of construction is from the early Edo period, and makes it easy for people to come and go from the shop.
Inside the entrance there is a display of ceramic tea jars that are several hundred years old, along with a small wooden statue of the Tsuen founder presented by Ikkyū Oshō.