Koichi Sakao's artistic practice explores the relationship between memory, place, and the natural environment. Through projects that engage with specific locations, his work invites viewers to consider how spaces hold layered histories and personal recollections. The artist's approach often involves direct interaction with communities, gathering stories and impressions that might otherwise fade with time. By focusing on everyday environments and overlooked details, Sakao creates a bridge between the tangible present and the intangible past, encouraging a deeper awareness of the spaces we inhabit and the memories they carry within their walls, streets, and landscapes.

The "Green Room Project" (Midori no Heya Project) is one of Sakao's notable ongoing initiatives. This project transforms ordinary rooms into immersive green spaces, blurring the boundary between interior and exterior, nature and architecture. By introducing living plants and natural elements into domestic or gallery settings, the project creates a contemplative atmosphere where visitors can experience a sense of calm and connection to the natural world. The work speaks to contemporary concerns about urban living and our increasingly distant relationship with nature, offering a quiet space for reflection within the built environment.

"Town Memory Project" (Machi no Kioku PROJECT) represents another significant thread in Sakao's body of work. This initiative focuses on documenting and preserving the memories embedded in particular towns and neighborhoods before they disappear due to redevelopment or demographic changes. Through workshops, interviews, and collaborative art-making, Sakao works alongside residents to capture the intangible heritage of their communities. The resulting artworks and archives serve as a testament to the lives, stories, and daily rhythms that define a place, creating a lasting record for future generations to appreciate.

Water-related themes feature prominently in Sakao's projects, particularly through the "Niigata Water Memory Project." Water serves as a powerful metaphor for memory itself—fluid, ever-changing, yet capable of holding deep traces of the past. This project explores the relationship between communities and their water sources, from rivers and lakes to seas and rainfall. By examining how water shapes landscapes and lives, Sakao highlights the ecological and cultural significance of this essential element. The work encourages viewers to consider their own connections to water and the environmental responsibilities that come with them.

Community participation lies at the heart of many of Sakao's projects. Workshops and collaborative events invite people of all ages to contribute their own experiences and creativity, making art a shared process rather than a solitary endeavor. This participatory approach not only enriches the final artworks but also strengthens community bonds and fosters a sense of collective ownership over local cultural heritage. Through these engagements, Sakao demonstrates that art can be a catalyst for dialogue, connection, and mutual understanding, transforming passive observation into active, meaningful participation in the creative process.