Some authorities hold that as long ago as 6000 B.C. magnifying glasses were used by the Chaldeans in the ancient biblical lands. It is known that the Chaldeans, who developed an elaborate civilization, gave first attention to the study of light and all its problems. A few thousand years before the new era the Babylonians, famed too as gardeners, became great astronomers. The heavens, then and now, present the greatest natural light and shadow show, with a continuous run every night since the beginning of time. So it is not surprising that the first study of light and shadow should concern itself with the stars and planets. The Babylonians, with but the naked eye, picked out constellations and identified them. It was a desire to learn more about the stars that resulted in the development of a telescope, which was a marked advance in the science of light and shadow. In the ruins of Nineveh, destroyed in 606 B.C., was found a convex lens of quartz and an inscription too fine to be read by the naked eye--proof that those people knew the uses of lenses and treasured fine artistic drawings and writings which could be inscribed only through the use of a magnifying glass. * * * * * At an early date the conflict arose between those who wished to use the magic shadows to entertain and instruct and those who wished to use them for purposes of deception. The Egyptian priests have first claim on the title of light and shadow showmen. Some of the fragments of hieroglyphics indicate that they used optical devices to deceive. It is likely that a simple mirror was used to throw images into space. But that would have amazed the people and would have been taken as a sure sign of miraculous power. The oldest media of light and shadow entertainment and deception was developed by another great and scholarly group, the early Chinese scientists. These were the Chinese Shadow Plays, the origin of which is lost in antiquity, dating back perhaps to 5000 B.C. Silhouette figures shown on a background of smoke and animated as in a puppet show entertained a public thousands of years ago in the Far East. The Chinese Shadow Plays appear to have a close relation to the old-time fireside tricks of twisting the fingers so as to form what appeared to be the shadow of a donkey’s head or a representation of a rabbit or of some other animal. Despite the troubled history of China, these Shadow Plays were never lost and they are still presented in remote parts of China and in Java. Dates of the Chinese contributions to the story of the origin of the cinema and related sciences are uncertain. The Chinese empire was founded around 2800 B.C. and within 500 years of that time the heavens had been charted by the Chinese. A hundred years after an hereditary monarchy was established in China, about 2200 B.C., the ruling powers executed two astronomers for failing to observe properly an eclipse of the sun.