If we were dreaming, our consciousness or ourselves were trapped within dream realm. At that case, if we consider dream realm is illusion or less real than our waking life, then we can say that ourselves is less real. If we can live with that then we found thing that is less real which it's ourselves.
It's a demonstration that quantum entity (electron, photon, etc) can display characteristics of both waves and particles.
The observer had ability to change the way quantum entity (electron, photon, etc) behave, in the sense that when we were observing it, suddenly we found particle pattern, otherwise we saw interference pattern (wavefunction).