In collaboration with students from Cardiff University, architects Takeshi Hayatsu and Kristin Trommler built a 6.6-by-6.6-foot teahouse inspired by a 16th-century Japanese version in Kyoto called Tai-an. Surprisingly, they used an ancient Welsh construction method called wattle and daub, where woven hazel rods are attached to exposed timbers, then daubed on both ends with a chopped straw, soil, dung, and clay mixture.