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THREE-DIMENSIONAL MOTION PICTURES Thus light is a force which is created, so to speak, by physi cal or chemical causes; it is not a permanent state of matter. Being created, it has a beginning. The stimulus starts at its origin, the source of light, and it must travel to reach the eye. How and what makes light travel has been one of the very first questions that Science has tried to answer and to this day no positive answer has been made but the investigations carried on have given rise to theories or principles and suppositions which have received a certain confirmation as to their validity for they explain the phenomena pertaining to light. Bodies are called transparent or opaque according to their faculty of permitting light to go through them, or by checking its course. In both cases some readily seen, and, thus measur able, phenomena happen. When light encounters a transparent body, for instance, it is always deflected from its course and this deflection is constant for any portion of the same body and is always of the same order for all transparent bodies. This deflection of the light is then subject to some physical laws which have been ascer tained to be always governing the passage of light from one transparent body into another. Likewise when light strikes an opaque body it rebounds and is reflected and the reflection is always subject to other laws from which it never deviates. Other phenomena pertaining to light are also found to be regulated by innumerable physical laws. It is the study of these phenomena, the discovery of their ef fects, functions and governing laws which have been investi gated and measured with great accuracy, and the relationship that has been found to exist among themselves and with regards to other fundamental laws regulating other physical phenomena such as heat and sound, has permitted science to promulgate the above mentioned theories and to sustain them by applying them to the explanation of all such phenomena.