Because colour is relative to context. An object made of the exact same material will give different RGB values in a photography depending on context. If it’s in the shade then the white balance will be slightly blue. Also two different materials could give the same RgB values depending on context. If your brain thinks it’s seeing the dress in the shade then it thinks it’s white and gold, but if it thinks it’s in daylight then it sees those same values as blue and black
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