Brian Greene - What's Beyond The Double Slit Experiment ? This tells that, what we think matter is, is not what really is. What really is, is a potential, and what we see is a small small small part of this potential. So reality is not the physical world, reality is infinitely bigger, and the physical world is like a slice of it, or a projection of it, like a shadow would be. Reality is the whole! Do you go left or right? No, you go left AND right!
Veritasium - The Original Double Slit Experiment Very well demonstrated, my friend ;-) So, light is a wave. But why is that and how it's done is the critical question