include real, external, independent things considered as objects of thought, and also, as Locke says what has been meant by such term as ‘phantasm’, ’notion’, and ‘species’ or what might now be called concept.”(Mackie)
In other words, Locke split his complex idea about ideas into two categories. The first one was the simple idea, or the idea that only use one sense. Such examples would include the secondary qualities (all of which depend on only one sense) of color (sense: sight), temperature (touch)…
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