These are mushroom-shaped toilets located beside the approach to Yoyogi Hachiman Shrine. In building these, we fully committed ourselves to achieving Mr. Ito's ideas 100% with no compromise, however difficult it might be. The round roofs proved to be the toughest point. Selecting materials to match the Building Standards Act was a mighty challenge. We got help from a metalworking company that was involved in preservation and restoration work on the Tokyo Station Marunouchi Building to form a single circle by pounding stainless steel sheets to expand and then weld them. I was highly impressed when the finished products reached the construction site.

In the factory we built the three-sided, bent frame for the doors to match the flared base of the building, the plate to prevent rainwater from collecting on the upper edges of the roof, as well as the struts for the roof. Getting these factory-built cylindrical pieces to fit the circle concrete frame cast onsite was no easy thing. But we had to achieve a good match to make it look beautiful. Each day on the site we repeatedly made tiny adjustments until we finally got it right. When we heard that Mr. Ito said, "You did a very good job of putting it together" after it was completed, we all sighed with relief.