MOUNTAIN&SEA settles on the hillside of Mountain Mashishan in Rushan, Weihai, Shandong, drawing from local mountain‑and‑sea mythology. It follows the terrain to minimize its visual mass and embeds along the contour lines. It creates a continuous circulation linking indoor, outdoor, roof, and mountain, with flexible exhibition spaces that allow visitors to experience the landscape throughout their journey. It uses low‑carbon materials—glulam & 35% recycled polycarbonate panels—and employs a dual “mountain‑and‑sea” spatial approach to integrate the cultural building with the regional ecosystem.