Nature as a building

As the world is preparing to show off at the World Expo in Shanghai, their pavilions are nearing their final stage. To me, it feels like a lot of them are making references to nature, or at least natural textures. Call it a coincidence, but it seems to me the countries that don't have that much nature left are the ones using nature in this country branding show. Biggest example would be the stacked Dutch landscapes in the Dutch pavilion at the 2000 World Expo.

British pavilion.

Spanish pavilion

Dutch pavilion for 2000 World Expo - made by MVRDV