= Primary-secondary quality distinction
{wiki=Primary–secondary_quality_distinction}
= Primary and secondary qualities
{synonym}
In an account of perception, distinguish an object's physical constitution from its powers to produce experiences in perceivers. The distinction between <primary qualities> and <secondary qualities> does not by itself prove an external world or imply that dispositions are unreal.<An Essay Concerning Human Understanding by John Locke>[book II, chapter VIII, sections 8–15 and 23–26]{ref}
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