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Omdt102 It's caused by machines. More advanced civilizations on parallel earths build them. They use them to move from one world to another. I know some basic stuff. I don't know the specifics. Typically these devices interface with the brain. It's like the internet on steroids. Audio, video, text. But, also emotions, thoughts, tactile sensations, smells ,even personalities. You can litterally look around you and feel the way the person connected to you feels. That's just the tip of the ice burg. Matter can be moved across part way. I don't know how it works but something can present across solidly enough to touch or bump into with a car. It can make a sound but yet not be here enough to reflect any light. You can't see it but you can feel it. I'm not sure how that works. There's not that much we know about physics. People and things midway across also sometimes look like black silhouettes or shadows. I think this is where the idea of shadow people comes from. I don't know why they look like that. The idea of a black hole or event horizon comes to mind.