The commutation relation [x^i,p_K] = i (h/2pi) delta^i_k defines particle dynamics in quantum phase space and reveals that wave-behavior and particle-behavior are complementary aspects of the same physical reality (wave-particle duality). So, this conception reveals an intrinsic dual nature of matter in the quantum realm.

Quantization of the gravitational field/space-time brings an interesting question. What kind of duality arises from the quantization of spacetime?