Yatu stands for now and spiritual healing also happens with no time lag. It effectuates the healing from the dimension of colour. There are different colours with millions of shades in this creation. Each shade is associated with specific attributes. Some are pleasant, soothing, some represent love, some divinity, some stand for power, some for anger, and some are dull and depressing. All are different and have different effects on the physical.
A clairvoyant uses these colours to assess the state of health or disease of a being. And through these colours the healer effectuates the koshas or the layers of an individual thereby affecting the physical body.