Hello, I was wondering : how come all letters all have the same corresponding sounds in all Indian alphabets, across space and across time ? In opposition to that, the letters of the Latin alphabet have seen their associated sound change dramatically over the time and the spread of its use to denote different languages. Is it that Indian languages evolved very little (*kh remained kh in all languages, etc...), or was it that every time one phoneme changed, it got rewritten with the letter corresponding to that new sound (let's say [*kh] lost its aspiration, all kh letters got replaced by k letters)? But then, what if it morphed into a sound that wasn't existing before ? Like [*kh] > [x] ? Did this never happen ?