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Natural, organic dust particles floating in slow motion.
A monochromic image is composed of one color (or values of one color). The term monochrome comes from the Ancient Greek: μονόχρωμος, romanized: monochromos, lit. 'having one color'.
A monochromatic object or image reflects colors in shades of limited colors or hues. Images using only shades of grey (with or without black or white) are called grayscale or black-and-white. However, scientifically speaking, monochromatic light refers to visible light of a narrow band of wavelengths (see spectral color).