In truth, very few have written on the subject of the science of colours, the role colours play in man’s self-knowledge, their influence on his personality, inquiring into their relationship and effect on his daily life, or investigating their role in his self-evolution. The book unveils the significance of colours in the human psyche, their symbols, their relation to the Cosmic rays and life vibrations, all of which are reflected in the aura, that electro-magnetic field surrounding man’s physical body. How do the colour rays interact in this field? How do they affect and in turn affected by man’s behaviour? All that is revealed in the aura’s colour undulation. For, colours are the language of the esoteric side in man and its nutrition, alike the food as nourishment for the body.