abstract appearance background banks cool dark ducks leisurely light lighting outdoors peaceful reflection reflections relaxing ripples rippling river river-banks river-views riverside seating seats serene serenity shade shadow shadows sparkle sparkling sunlight sunshine swans tranquil trees vegetations water water-birds waterways black & white greyscale alternative alternative-energy alternative-power alternatives angles bridge clouds concrete darkening energy exterior external glass lamp lamp-post lamppost lights outdoor path protected protection protective renewable safety security shapes shine sky solar solar-panels styles atmosphere atmospheric black cloud color colored colorful colors colour coloured colourful colours contrast contrasting dramatic dusk evening glory gold golden mood moody pink setting-sun shining silhouette silhouettes skies spreading street-lights sun sunset air aperture blue bright cloudy forest gray grey leaves nature opening outlook through weather white window conditions darkness formations textures thin vaporish vapourish variations various cloud formations wispy