if you were to compare a system of identifying these energies to the system we apply to colour by use of temperature , red = hot through to blue = cold you could say that sometimes it was light and other times dark with all the variations in-between , but the sense it utilised to reveal itself in coe was a perceptive sense which lies dormant in most humans , its element is fire , its utilised feature is our nervous system and its hq is balanced between the brain and the heart .