I discovered the Teshima Art Museum not while I was in Japan but this morning @molostudio and I was completely blown away by it's ethereal poetry. The Architect, Ryue Nishizawa, conveys a space that flows seamlessly with it's surrounding natural environment like a "droplet of water gliding across the land". Through the oval openings, the elements are allowed to interact with the structure creating a tangible, audible experience that continually changes. You can read more about it at designboom. This is number one on my list when I return to Japan.