Round windows were seen in ancient Chinese architecture in Japanese architecture, and in the early modern period they were used in shoin-zukuri, teahouses, and sukiya-zukuri. The round window in the main hall of Genko-an in Kyoto is called the "window of enlightenment," and the circular window represents the spirit of "Zen and Entsū," and the circle represents the universe.

Round windows are often used to create a stylish space that matches the atmosphere of the room. They also go well with Japanese modern styles, allowing you to create a space that combines traditional Japanese design with a modern, stylish design.