The building concept is a “Farming Kindergarten” with a continuous green roof, providing food and agriculture experience to Vietnamese children, as well as a safe outdoor playground. The green roof is a triple-ring-shape drawn with a single stroke, creating three courtyards inside. While these internal courtyards provide safety and comfortable playgrounds for children, the roof makes landing to the courtyards at both sides, allowing children to enter a very special eco-friendly experience when they walk up and go through it. This green roof is designed as a continuous vegetable garden, a place to teach children the importance of agriculture and relationship with nature