abstract background art astronomical object darkness electric blue lens flare light lighting pattern space water background close-up dew droplets drops group macro monsoon rain texture wet autumn bank clean disposal plant processing pure purify river sewage still treatment trees waste blue clear cold fresh long exposure moss mossy Mountain Creek rocks turquoise corrode corrosion industrial lettering metal numbers oxidation oxide paint pipe rust surface type urban wabi sabi wabisabi water pipe cascade down germany gill Harz mountains speed splash stone torrent waterfall beach bird birds feather feathers fly flying gull nature ocean pier port sea seagull Asia caves coast coastline color colored colors colour coloured colours distance distant expanse foliage growing growth Hong-Kong-islands Hong-Kong-waters islands layers levels natural outcrop plants rock formations rocky rough seashore shade shadows shapes shore shoreline Sizes stones stony sunlight sunshine variety vegetation waterline