Wie erkenne ich, dass diese Farbe Rot ist?—Eine Antwort wäre: ‘Ich habe Deutsch gelernt.‘ (Ludwig Wittgenstein, Philosophische Untersuchungen §381.) A discussion of color categories as they function in contexts which are unfamiliar to the reader introduces frustrations and misunderstandings, particularly when the reader's concerns are practical as well as academic and when they involve cross-cultural communication and interaction, for example during anthropological, psychological, or medical research. The reader who questions this observation may enjoy reading the following passage a second time, after he leaves the final word of our article.
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Landar et al. (1960) studied this question.