This transformation manifests as the rhythmic emanation and withdrawal of the universes. This leads to another important step of understanding. The material creation is temporal. It has a beginning and an end. This beginning and ending is the basis of duality.
Temporality means duality.
Everything in the material world depends on its opposite. Thus the material world is also called the relative world. Birth means death will come. Death means birth will come. This is applicable on all levels, up to the level of the entire universe, which forms a unity with the other universes.