Now if you have a water surface of 2cm high. You create waves with a height of 1cm above that 2cm, and a through of 1cm. And if a +1 wave runs into a -1 wave they cancel each other out, or also called wave destruction. But a similar pattern is seen with the double slit experiment. How is this possible? It is easy to visualize with water. But how can a photon or electron be canceled out? That should mean there is negative energy running into positive energy cancelling each other out? With my simple brain, the way I see it, there is either a photon in a vaccuum, or there is nothing. How can it cancel itself out? Does this mean a vaccuum is not really empty? I know the water waves and electron waves are very different and not comparable, but still the destruction of waves is still seen in similar ways in both cases. If someone can give me some explanation on this, much appreciated!