Every man from birth to judgement day experience many kind of emotions and one of those are happiness. Happiness is expressed in nature is create a Positive Energy Particles.
That thousand Positive Energy Particles form Positive Waves or simply Waves. As child go from childhood to adolescence he intentionally or unintentionally preserve these Waves is his body. At some time it becomes hard for body to preserve more of waves so it form a dense sphere below Nabhi and is called Wave Core.
Wave Core colour shows how much happiness ones experience throughout life. It goes on ascending order of red; pink ; orange ; yellow; blue; grey; black and white.
After child form a Wave Core it receive awakening. One receive two things from awakening first is Astardust which is solid crystal embedded in forehead.
Astardust stabilizes the Wave core in body and converst Waves into Positive Energy. As Positive Energy is very small particles normal beings can't directly extract it from nature. Astardust gives an attribute to Waves in one's body.