Are you familiar with the double-slit experiment and wave-particle duality? Classically, it is believed that light behaves as a particle - that is it can only take one of the two paths offered by the double-slit experiment. And while being observed this appears to hold true. But if a single photon is sent towards the slits unobserved as to which path it actually takes, it creates an interference pattern as if it had taken both paths. The analogy for the wave-like behavior that is often applied is like dropping two stones simultaneously into a pool of water
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