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waterfall forest nature landscape scenery water rocks trees plants sunlight stream river cascade plunge rapids whitewater foam mist spray rainbow gorge canyon valley cliff mountain hill forest woodland trees leaves branches trunks undergrowth shrubs bushes flowers plants green blue white brown black colorful vibrant saturated desaturated muted soft hard light dark bright dim shiny dull reflective transparent opaque clear murky still moving fast slow calm stormy peaceful serene tranquil quiet loud noisy bustling crowded empty desolate isolated remote inaccessible untouched pristine natural man-made artificial constructed built created designed planned developed maintained preserved protected conserved restored rehabilitated renewed refreshed rejuvenated revitalized reclaimed repurposed reused recycled upcycled downcycled sustainable eco-friendly green environmentally friendly low-impact minimal-impact no-impact regenerative restorative healing therapeutic medicinal curative beneficial positive negative impact effect consequence result outcome change transformation evolution progress development growth expansion contraction reduction decline fall collapse destruction extinction end beginning cycle spiral circle loop wave sine cosine tangent cotangent secant cosecant arc sine cosine tangent cotangent secant cosecant degree radian minute second time space matter energy life universe everything