A family-resemblance approach to categorisation, such as that developed by Wittgenstein, provides a basis for conceiving how various historical types of 'anger' can be recognised as similar despite their variability and lack of core defining features. Thomas Dixon's essay applies this approach in a way that avoids radical relativism and acknowledges general human emotional capabilities. His approach may arguably be extended to commonalities between emotions of humans and animals, which would

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... e interesting implications for the history of emotion.