The design of the New Museum of Architecture and Design is rooted in a harmonious connection with its historical surroundings and cityscape. It offers an open, inclusive space that engages the public and fosters cultural exchange. Flexible spaces encourage interaction, while green areas and terraces integrate with the surrounding landscape. By merging indoor and outdoor spaces, the museum emphasizes ecological, social, and economic sustainability through the use of locally sourced Finnish birch, natural light, and ventilation to reduce energy use. Green spaces enhance biodiversity and visitor well-being. The façade features vertical wooden slats inspired by Finnish birch forests, controlling light entry and visually connecting the museum to Finland’s natural landscape. The slats regulate sunlight and shadow, dynamically responding to Helsinki's light cycle. The building adapts to Helsinki’s seasonal light cycles. Terraces, serving as light and view-seeking platforms, are oriented to capture low winter light, provide summer shade, and offer views of the sea, the city, the cathedral, and the park. The ground floor is an open, reprogrammable urban space-a "green corridor" connecting existing public spaces: the waterfront, Helsinki's Old Market Hall, and the park area on Tähtorninvuori hill. This creates a fluid flow between the museum and the city, making the museum an extension of the urban fabric.