Thirty metres down, sunlight arrives already blue, and everything that wants another colour has to make it itself. Reefs oblige extravagantly — coral in mineral pastels, fish in colours that would be vetoed in any design meeting as too much.
The photographs here were chosen for clarity above spectacle: single fish in portrait, coral heads like slow explosions, that particular gradient where turquoise shallows fall away into serious blue.
An underwater wallpaper does something no landscape can — it removes the horizon entirely. No up, no distance, no schedule. Just blue, going on.