From the bower of leaves, the path leads to the tea-house or summer-house with a double roof. In China, tiled double roofs indicated that the owner of the house was of high social status. Examples include the roofs of the Forbidden City in Beijing. The Leverkusen tea-house was inspired by Chinese architecture, and some of the furniture inside is from China.
Source: „The Japanese Garden of the Bayer AG at Leverkusen", published by Bayer AG, Communications, Leverkusen