It is a small world. But to people in that world, it is not a small world. It is whole world to them.
Name of that world is htrae. Sometimes, its color cotinually turns blue and red and green.
The people in that world thought they have a perfect law, so they kill everyone who had the other colors. Because, except 3 colors, all colors are wrong they thought.
However, they noticed that the other colors are combination of 3 colors.
Then, the world are going to change.