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Purple exists only in our brains
Most colors represent a single wavelength of light. But your brain invents purple to deal with wavelengths from opposite ends of the visible spectrum.
gradient: From the word “grade,” it describes the incline, slope or degree of increase in some measure (such as temperature, pressure or even color) that develops as one moves in time, position or along some scale. prism: A triangular wedge of glass or another clear substance that can bend the components of white light into a rainbow-like succession of colored bands. Similarly, trains, platforms, tracks, roadway signals and overpasses are among the potential components of a nation's railway system.
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