चित्र means a picture (painted in a paper or wall) and तुरग means horse. This Nyaya is conceptualised on the basis of the horse painted on a wall or on a picture.
The horse painted on a wall and real horse are different in their own ways. Real horse is real and a painted horse is painted one unreal. One is real, the other is imaginery still however, it is a fact one can have some knowledge of horse seeing the shape, form, colours of a horse painted on a wall or a paper. Suppose somebody does not have a real horse still however he wishes to know about a real horse. For a man in such a situation it is not necessary to present a real horse before him. In its absence or unavailability also such an inquisitive person can be given an idea of a areal horse. This "Nyaya' is conceptualised to give a sense an idea that in this way also knowledge can be imparted.
Science of medical science sometimes try to know the real limbs of a human body with the help of pictures of limbs drown on a paper or the artificial limbs made of plastic (or plaster of paris). Inspiration of such an activity can also be had from "Chitraturaganyaya When a historical play is staged the real character is not present on the stage but through the unreal character audience can experience the feeling of seeing the real historical character by knowing the unreal character. Thus, one can attempt to know about the real with the help of unreal character or a thing. To import this understanding this kind of 'Nyaya' proves to be useful.