Rafael Viñoly's 1996 glass-hull atrium in Marunouchi — boat-shaped main atrium, 60 m clear-span.
From Wikipedia
The Tokyo International Forum is a multi-purpose exhibition center in Tokyo, Japan. The complex is generally considered to be in the Yūrakuchō business district, being adjacent to Yūrakuchō Station, but it is administratively in the Marunouchi district.