Color is fundamentally a construct of the mind, though it relies on raw physical data from nature to exist. In the physical universe, there is no such thing as “red,” “blue,” or “green”; there is only electromagnetic radiation moving at different wavelengths. Sir Isaac Newton famously noted this distinction, writing that light waves themselves are not colored, but merely have the power to stimulate specific sensations in our brains. The Fact of Nature: Wavelengths
The physical reality behind color is a tiny sliver of the electromagnetic spectrum called visible light, which ranges from roughly 380 to 740 nanometers (nm).
The Spectrum: Objects in nature absorb certain wavelengths and reflect others based on their atomic structure.
The Stimulus: A leaf absorbs most light but reflects wavelengths around 510 nm. While the 510 nm wavelength is a concrete fact of physics, the perception of “green” is not. The Construct of the Mind: Biological Interpretation
Color is a biological translation tool created by our evolutionary wiring to help us categorize and navigate our environment. Purple exists only in our brains
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