Introduction to the Netherlands Pavilion: Theme: Happy Street. The winding "Happy Street" has no doors, so visitors can start "shopping" from any direction. The 50 orange umbrellas can not only protect against sun and rain, but also absorb, accumulate and convert energy into electricity that can be used by the exhibition hall. None of the 20 miniature exhibition halls can be entered, and visitors can only view the exhibitions through the glass windows.