I’ve been trying to discuss this idea for nearly a half century. I was 11 years old when I first discovered the story of Flatland, and after thinking about what a 3 dimensional being was like to a 2 dimensional being extrapolated what must it be like to a 4th dimensional being visiting our universe. Along those same lines it occurred to me that if 85% plus of the universe is Dark Matter, then might it be we are the tail thinking we wag the dog? What if we are a shadow realm or dimension and Dark Matter is a limited perception of the primary universe. Perhaps in the same way the Earth and later our star system not being the center of the universe, perhaps our view of the universe is also a peripheral aspect of a primary universe we know almost nothing about.