From the actual study: "Himba participants show categorical perception only for their own linguistic categories and not for either the supposed universal catego

From the actual study: "Himba participants show categorical perception only for their own linguistic categories and not for either the supposed universal categories of English" Roberson, D., Davidoff, J., Davies, I. R., & Shapiro, L. R. (2005). Color categories: Evidence for the cultural relativity hypothesis. Cognitive psychology, 50(4), 378-411. On top of that there is also Berinmo tribe that " marks a color boundary that is absent in English (i.e., a boundary within the English green category), but also fails to mark other boundaries that are found in English (e.g. the boundary between blue and purple (Roberson, Davidoff, Davies, & Shapiro, 2005)"