Unfolding a Tidal Letter

Generate exactly one image. Intended aspect ratio 4:3. An ivory envelope opened on a rough limestone table, with a folded letter becoming a delicate tidal coastline as it unfolds: paper ridges transition into real sand, one narrow incoming wave and tiny dark pebbles. High oblique macro still life, natural side light, pale beige, sea-glass green and soft graphite. Original tactile surreal editorial art, coherent sheet geometry and believable wet-dry transition. Intimate scale, a single clear transformation. No writing, hands, logos or watermark.