kyle_baron ! True, if it's a timed event, then it was observed, and it's position is known. Therefore, the quantum state of the photon wave, has collapsed into a particle. <br />But, when the photon is not observed, it's quantum state is intact. And in this state, the photon exists as a probability wave, over the entire universe! <br /> Yes, the above is true, and is the way I see the relationship of wave and particle.