 It has already been mentioned that the three constituents of Ur-Nature are always in transformation. Before the beginning of creation or empirical manifestation of Ur-Nature, there is a homogeneous transformation (sadrśa-pariṇāma) of the principles, sattva transforms into sattva, rajas into rajas and tamas into tamas. At the time of world-manifestation the active principle, rajas, becomes predominant and activates the other two principles. The stability of Ur-Nature is disturbed due to its close proximity with the Self (puruṣa), an independent co-eternal reality, like a piece of iron in proximity of a magnet, and the process of heterogeneous transformation begins. The constituent principles of Ur-Nature combine with one another in different proportions and the manifold world comes into existence.