The glass waves on the exterior of The National Art Center of Tokyo are a hint of the towering, clean glass and concrete interior architecture. The museum has a welcoming interior filled with natural light, lounge chairs, and cafes. The building itself is a sleek design exhibit.
While at the art center, we saw the California Design 1930-1965 "Living in a Modern Way" exhibit, which had lots of Eames furniture, vintage wool swimsuits, and modern architecture. New exhibits rotate through regularly, and it's a great place to enjoy art and relax inside a beautiful work of art.
Take the Tokyo Metro Hibiya line to Roppongi Station. It's about a 5-minute walk. Directions to The National Art Center: http://www.nact.jp/english/access.html