RANGI is a powerful song that uses the analogy of COLORS and FLAGS to depict the truth about the SABBATH. There are different colors that make up a spectrum, yellow, white, red etc. One color cant be the other color and vice-versa.
In the same way, there are different days of the week, one day cant be the other. The 2nd day cant be the 3rd day and vice-Versa. In a similar context, each country has national colors (Flag). You can not take a flag of one country to represent a different country.
The song concludes that, in a similar fashion, the CREATOR GOD created everything in 6 days and set aside the 7th day sabbath as a memorial of His creator-ship, and He has called it SABBATH for all His people
