There is no such thing as reality, but the same sensation that you perceive on a movie theater, plus every action and reaction that every living thing, stone, virus, fungus ...whatever you can imagine. This action and reaction (even retroactively...like particles turning in the other direction when you look at them). Tachyon's flowing from the Universe Center 22.5 trillion times per second is the water of the river call Time. Maybe you can call it Stygia too...