Do all languages divide colours the same way?
Languages genuinely divide the colour spectrum into different numbers of basic categories — Russian distinguishes two blues English treats as one, while Japanese historically used one term for what English splits into blue and green — a difference in vocabulary and habitual categorisation, never a claim about what speakers can actually perceive.
Russian has two distinct basic colour terms, goluboy (light blue) and siniy (dark blue), where English uses one word, 'blue', for both.
Russian
Historically, Japanese used one term, ao, to cover what English now splits into 'blue' and 'green'; a traditionally 'green' traffic light is still called ao shingo in Japanese.
Japanese
Related colour profiles
Every claim above is scoped by the specific culture, region and/or period it applies to — none of these associations are presented as universal. See pigment and dye history for more.