background below blue coral dark deep green life movement night peace relax sea under underwater wallpaper water air aqua bubbles dive drowning jell light sea blue shades swirl swirly thick turquoise Ceredigion chasm cliff Devil's Bridge gorge high narrow natural nature plants rock stone wales welsh wet aquifer circle concentric craft India masonry reservoir ring rings Stone Well stonework wall well work abstract changing choppy color colors colour colours cruise-liner cruise-ship currents deep-blue distance distant ebb-and-flow expanse foam foaming froth Indian-ocean motion ocean powerful reflections ripples rippling salt-water sunlight surf surface texture textures troughs vast vibrancy vibrant view wake wash waves white horizon