Ultra realistic underwater photograph, 4:5 vertical. A grand piano sitting on the ocean floor in shallow tropical water, colonized by marine life over years of submersion. MATERIAL PHYSICS — THE PIANO: A concert grand piano — approximately 9 feet long — resting on white sand at approximately 20 feet depth. The piano is upright (not overturned), lid propped open on the long stick, exposing the strings and soundboard to the water. The piano has been submerged for years: The ebony finish: Faded from glossy black to a dull dark grey-brown, the lacquer cracked and peeling in sheets. Patches of the bare wood show through where the lacquer has fully detached. The keyboard: The white keys have yellowed and some have detached, floating slightly upward from their pins (ivory is buoyant). A few keys are missing entirely. Green algae covers the key surfaces. Small sea anemones have attached to the exposed key pins. The strings: Still present but corroded — the steel bass strings are heavily rusted to an orange-brown, the treble strings are thinner and some have snapped, their curled ends waving in the current. Coral has begun growing on the cast iron frame — small branching formations in orange and pink. The legs: All three legs are intact, sunk 2 inches into the sand. Barnacles encrust the lower legs. A moray eel's head peers from the dark space inside the piano body beneath the soundboard. The lid: Propped open, the underside colonized by purple and orange sponges. A school of small glass fish shelters in the triangular space between the lid and the body. MATERIAL PHYSICS — ENVIRONMENT: White sand floor with small ripple marks from current. Turquoise water — clear, with three visible shafts of sunlight from the surface creating bright diagonal beams and caustic light patterns dancing across the piano and sand. A few sea fans (gorgonians) grow from the sand near the piano — purple and red, swaying in the gentle current. A single juvenile sea turtle passes in the background. CAMERA: Underwater housing, Nikon Z8, 18mm wide angle, f/5.6, ISO 400. Natural light only. NEGATIVE PROMPT: person, diver, clean piano, indoor, dry, cartoon, text, watermark.