Create a striking Spring 2026 city poster for Boston with an elegant celebratory mood and a bold contemporary design. On a clean off-white textured background with generous negative space, place a miniature single sculler in the lower-right corner rowing across a narrow ribbon of reflective water. Let the wake curve upward and gradually transform into the Charles River, then into a dreamlike hand-painted panorama of Boston featuring the Back Bay skyline, Beacon Hill brownstones, Acorn Street, Boston Public Garden, Swan Boats, the Zakim Bridge, harbor ferries, and historic brick architecture. Add soft morning fog, golden spring light, subtle crimson and gold festive accents, layered depth, and premium editorial typography that reads "SPRING 2026" with a vertical slogan about river, memory, and invention. Vertical poster ratio, polished graphic-design finish.