I just realized that visible light spectrum, as it is taught in physics classes, is different depending on the language. Of course it is just a gradient and we

I just realized that visible light spectrum, as it is taught in physics classes, is different depending on the language. Of course it is just a gradient and we distinguish 7 colors from it so we could remember the pattern, but those 7 colors differ. In my language, Lithuanian, we have names for light blue and dark blue (just like in Russian, as mentioned by Alex). These two colors sit between green and violet in our simplified 7color spectrum. They do not directly link to blue and indigo in the English spectrum.