as you can see the structural grid to the building is a vortex like structure that accomodates all the building vertical transport services through the 4 floors

planning for the "sendai mediatheque" began in 1994. at the beginning, plans called for a multifunctional facility comprised of a library, gallery, visual media center that also contained services to aid the sight-and hearing-impaired.subsequently, plans changed so that instead of simply being a "mixed-use" facility, it was intended to encompass a larger sphere of functions that would allow the facility to operate as a unified "mediatheque" with common goals to respond to a continuously changing information environment and users' diverse needs.the "sendai mediatheque will gather, preserve, exhibit, and present various forms of media without being bound to form or type. this public facility for the 21st century will, through its various functions and services, be able to support the cultural and educational activities of its users.

http://www.smt.city.sendai.jp/en/

Me IN JAPAN - SENDAI

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Sendai Mediatheque, a building in Sendai designed by Toyo Ito
Toyo Ito (伊東豊雄, Itō Toyo'o; 1941-) is considered "one of the world's most innovative and influential architects" (Designboom).
Ito is known for creating extreme conceptual architecture, in which he seeks to melt the physical and virtual worlds. He is a leading exponent of architecture that addresses issues of the contemporary notion of a 'simulated' city.
Born in Japan, Ito graduated from Tokyo University's, Department of Architecture in 1965. After working for Kiyonori Kikutake Architect and Associate from 1965 to 1969, he started his own studio, 'Urban Robot' (urbot) in 1971, in Tokyo. In 1979, the studio changed its name to Toyo Ito & Associates, Architects. Throughout his early career Toyo Ito constructed numbers of private housing projects that revealed the hiden layer of urban life in Japan. His most remarkable early conceptual contributions were made through the projects of this scale. See White U in 1976 and Silver Hut in 1984.
With the 'Pao for the Tokyo Nomad Girl' Project's in 1985 Toyo Ito developed a vision of a life of an Urban Nomad, illustorious to the human life involved in the bubble economy of Japan.
Tower of winds in Yokohama in 1986 and Egg of winds in 1991 are interactive landmarks in the public space as the result of creative confrontation with the technical possibilities which the future will bring.
Toyo Ito is known in Japan to raise talentful younger generation of architects. Architects who worked for his office includes, Kazuyo Sejima (SANAA), Klein Dytham Architecture