Since the four basic elements, i.e. water, earth, wind and fire move only in one direction, downwards in the case of water and earth, upwards in the case of wind and fire, and their motion is always arrested once their respective goals have been reached, it is clear that their path is predetermined for them, and that they are not free agents. When we observe movements in the sky, we observe unceasing motion in apparently forward and backward direction. (orbit) This could suggest that the objects in motion are possessed of intelligence or are directed by intelligent beings. Since our traditions are not too clear about all this, we are permitted to reject this idea altogether and simply postulate that these heavenly bodies have been given different properties from the four fundamental elements comprising earth. Motion of the celestial bodies is on the one hand unceasing, yet their exact path is precalculated and departure from it is not possible either regarding their speed or direction of movement. Most Midrashim are compatible with this theory.