Ego starts living from experience versus expressing from its spiritual essence. Time is created as a frame work to form perceptions from your experiences. Chakras are modified to store your perceptions. Emotions are created. Human's at a physical level move from living from their Divine mind to their analytical mind.
Divine mind is the spirit or all that is.
The mass consciousness of humanity agrees to create death to escape the entrapment of the physical. Birth is created to reenter physical. This marks the beginning of past life cycle.