In the universe there are two intertwining dimensions. Our dimension, which we live in, and the opposite dimension, where exact duplicates of ourselves live. Both versions of ourselves do the exact same thing as the other at the same time. The only time the duplicates are able to see each other are when they walk past a reflective object. (mirror, some windows, spoons etc.)
When you try to pass through to the other side, your reflection, your doppelganger, blocks your path, to prevent you from crossing the fields of space. This is because one side is filled with pain, suffering and many types of distressing events. And the other is filled with happiness, where nothing is a worry.
The only question is, what side are you on to begin with?