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The readings can be interpreted in a variety of ways and students should formulate some initial positions and questions to offer in the class discussion . Figure 6 shows that drainage causes the water table to drop the distance " h " from its initial position at 1 to its final position at 2 . For instance , given an initial position of a system of n congruent circular or square modules in the plane , is it possible to transform it into a prescribed target position , obeying certain natural motion rules ? The ball 's trajectory is determined by its initial position and direction of motion . He ’ d then reconnect the original master and you could see both firewalls resume their initial positions . The lightning 's reflection through the clouds was accomplished through a photon map , as described above ; we used uniform random sampling of the lightning to generate photon initial positions , and traced their paths through the clouds to generate the photon map .