covered depth depth indicators distortions lines platform pool pool floor rippling rubberised surface surface swimming pool tiled surface water dangerous drop fall fast fierce kjosfossen natural nature norway norwegian pour powerful raging rocks spray thunderous violent waterfall cliff bank canoes estuary forest green hills landscape Mawddach peaceful river shore tranquil trees view wales welsh beach blue caribbean coast coastline Dominican dream dusk lighthouse palm relax republic sand sea sky sunset tree tropics canada clear lake moraine mountain range reflection Rockies Rocky Mountains snow transparent Asia building cloud government Kuala Lumpur Malaysia masjid mosque Night Scenes Putrajaya scenery structure