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In philosophy, a secondary quality refers to a property perceived through our senses that doesn't accurately represent the object itself. These qualities, such as colors, sounds, tastes, and odors, are believed to exist only in our consciousness, not as inherent characteristics of the object.12

This concept is contrasted with primary qualities, like shape, quantity, and motion, which are considered genuine properties of objects and can be described mathematically. Philosophers like John Locke distinguished between these, suggesting that while primary qualities are objective, secondary qualities are subjective modes of perception induced by an object's primary qualities.21

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