Representation in the National Pavilions of the 21st Century World Fairs Host Countries

Expo Fairs are significant international communication, interaction, representation and competition platforms that have been held every 5 years since 1851. These fairs exhibit the technologies, innovations, socio-political and cultural characteristics of their periods and changes in the architectural discipline not only with their themes, but also with their representation pavilions. Fairs have the power of shaping the world of the future with their prospective designs in various fields that concern the whole world, such as engineering and architecture. The prominent trouble of our age, "sustainability", is chosen as the agenda of the 21st century Expo fairs, with the help of this nature, natural resources, energy and environmental issues that concern all humanity are evolved to the generation of ideas. The national pavilions exhibited at the Expos have essential indicators that reflect the cultural identities of the countries and/or the interpretations of the fair theme under the title of nature. Based on Umberto Eco's semiotic theory; The fair theme of the country pavilions and the way they use the country architecture as a sign is chosen as the research topic.