The idea of creating a building related to the sea involve the relation betwin the natural environement and the city.The thematic pavillon is representing the civilisation, and the growing economy of Korea.The project will be an interstice betwin the moving city and the nature.The Theme of the building is to interact theses two elements in one : the Big “O” will reflect the ocean forces suchas the city.The project is thought as a regular layer building, who is crossed by the ocean. An open wave will offer to the projectan atrium reflecting the sea aspect and space. This space related on one side the city and on the other side the naturelandscape will contain the main lobby, and could accomodate big scale exhibitions and sculptures.As an exhibition pavillon, the thematic pavillon will offer big space, organised as open space in order to be flexible intermes of exhibitions, flexible in time, for the future of the pavillon, and flexible in uses.All the floors are connected to an elevator, security staircases and big loading decks in order to have a perfect organisationand maintenance.The blue economy is the association of an new type of architecture and the way of building it. The thematic pavillonwill offer new shapes of constructions, with his organic shape related to his rationnal shape. This interaction willdefined the blue econmy such as a meeting betwin the human and the nature.The blue economy is also diffine as a sustainable economy, the thematic pavillon will integrate all the new way ofsaving and producing energy.The steel construction, easy to build and to preserve could accept all type shapes, rationnal and organical. The skinof the project is in ETFE : designed to have high corrosion resistance and strength over a wide temperature range. ETFEhas a very high melting temperature, excellent chemical, electrical and high energy radiation resistance properties.Compared to glass, ETFE film is 1% the weight, transmits more light and costs 24% to 70% less to install. It’s also resilient(able to bear 400 times its own weight, self-cleaning (due to its nonstick surface) and recyclable. On the otherhand it is prone to punctures by sharp edges, therefore it is mostly used for roofs.The Thematic pavillon will use the high technology in order to be a reference in terme of sustainability, rationnality,economy and design.The project will open a new langage melting liquid and solid architecture reflecting our world, our planet and oursystem.