In many languages other than English there is a word for mother' s brotherwhich is different from the word for father' s brother,  whereas English uses the word uncle for both  Thus, speakers of these languages evidence a more finely discriminated kinship system than English speakers do  The number of basic words for colors also varies widely from language to language
Ttherefore, speakers of languages that have fewer basic words for colors than English has must be perceptually unable to distinguish as many colors as speakers of English can distinguish
Speakers of English are able to distinguish between lighter and darker shades of the color they call blue, for which Russian has two different basic words.