The flame and the void

… Tam said, “Remember the flame, lad, and the void.” It was an odd thing Tam had taught him. Concentrate on a single flame and feed all your passions into it – fear, hate, anger – until your mind became empty. Become one with the void, Tam said, and you could do anything.
Robert Jordan “The Eye of the World”

As to the picture … yeah, you are quite right – the color replicas are just diffractional images (from a square grating) of the main flame. Let them not to distract you. You know your flame – concentrate on it!