The energy relating to each of the seven spectrum colours of red, orange, yellow, green, blue, indigo and violet, resonates with the energy of each of the seven main chakras/energy centres of the body. If you can imagine the chakras as a set of cogs/wheels, they are rather like the workings of a clock or an engine. Each cog/wheel needs to move smoothly for the clock/engine to work properly. Thus good health and well being is achieved by a balance of all these energies