The conception of our project begins with the image of the universe as it was pictured in olden days. It seems that the word firmament comes from the latin firmamentum. It is a constant in several ancient traditions, especially in monotheism, to consider the sky as something solid and heavy. It is said in the Bible that God created the firmament in order to separate the waters into two oceans: the first one below, the other one above. The firmament was thought as a kind of solid dome which aim was to hold the water above but, sometimes, part of the water would fall down through the stars in the form of rain. In old days, people were afraid since they believed that at anytime the firmament would fall down because of the weight of the water.