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autumn forest colorful trees nature landscape fall foliage colorful leaves vibrant red orange yellow green blue purple pink brown black white gray dark light bright muted saturated desaturated warm cool contrasting complementary analogous monochromatic polychromatic chromatic achromatic neutral primary secondary tertiary hue value chroma saturation lightness darkness brightness tint shade tone temperature mood atmosphere feeling emotion expression impression perspective depth dimension space flat two-dimensional three-dimensional dimensional shape form structure line point plane volume mass weight density solid liquid gas energy matter physical material substance essence nature world universe existence reality life death time spacetime eternity infinity void nothingness all everything the universe the world life death time spacetime eternity infinity void nothingness all everything