In Kogi cosmology, they have added three dimensions to the standard N/S/E/W: Zenith, Nadir and the Center. This fixed system of points resembles an egg, and is formulated into nine stages/layers of development. Mother Goddess, the creator of the universe and mankind, created the cosmic egg. The horizontal layers of the egg are divided into two sections of four worlds with mankind (the 5th layer) residing in the center. The cosmic egg also represents the uterus of Mother Goddess and the Sierra Nevada. Because of this, the Kogi have built the structure of the ceremonial house as a replica of the cosmos.