Every language in the world has its own quirks and funny little ways of expressing itself. Read more about how colours are expressed in different languages around the world ...
Most people around the world can perceive the amazing array of different colours that exist ... however, different languages do not consider the basic colours to be the same! When it comes to describing those colours in words something strange (at least to our English-speaking ears) can happen.
On the other hand, Vietnamese and Navajo are examples of languages that only have one word that covers both green and blue. In Vietnamese, the colour xanh describes both the colour of the blue sky and a green leaf. If you need to differentiate, then blue can be called xanh da trời (sky xanh, light blue) or xanh dương (ocean blue, darker blue) or xanh lá cây (leaf xanh, green). Even in Japanese and Korean, a green traffic light is called a "blue" light.
Some languages may have the same colours as English, but the boundaries are different. For example, traditionally in Welsh there is gwyrdd (green), glas (blue) and llwyd (grey). However, green leaves and green grass are "glas", but a green painted fence would be "gwyrdd". This is because the colour gwyrdd covers non-blueish green, whereas the colour glas covers living green, greenish blue, greyish-blue, and colour llwyd covers grey which is not blueish at all, rather more brownish grey. So a leaf, the sky and the sea can all be described as the colour glas, whereas in English the leaf would be green, the sky blue and the sea grey!
This concept of different types of grey, which may blur into brown, is also found in Spanish where the colour pardo can mean brown or grey depending on what is being referred to. When a bear is pardo it is brown, but when sky is pardo it is grey. But grey metal would be the colour gris.
Basque used to only have the one single colour urdin that covered the three colours green, blue and grey. However, nowadays the word urdin is used for blue, and berde (from Spanish) is used for green, and gris (from Spanish) for grey.