= Primary–secondary quality distinction
{wiki=Primary–secondary_quality_distinction}
The primary–secondary quality distinction is a philosophical concept introduced by the philosopher John Locke in his work "An Essay Concerning Human Understanding." It classifies qualities of objects into two categories: primary qualities and secondary qualities. 1. **Primary Qualities**: These are features that exist in the object itself, independent of any observer. Primary qualities include characteristics such as solidity, extension, motion, number, and figure.
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