For most people, reality is a pretty firm concept. It's a solid thing shared by everyone else, and a room painted blue will always be blue no matter which doorway you enter it through or who else is in the room with you or who walked through first, it won't suddenly be red because you waited an hour before you went in.
And then for some people reality is a little different. Reality's more like a bunch of dominos made out of play-dough, being reshaped (largely unintentionally) every time it's touched, and changing all the events that come after, knocking over entirely different dominos in the process. Or... something. You know what, there's not really a good way to describe the way reality works for these poor suckers. Suffice to say, because you waited an hour, the room is not only no longer blue, the walls are covered in tentacles and now want to molest you. There, how's that?
Become one of these weirdos and watch as reality bends around you, the mundane becoming strange, the strange fantastic, and the fantastic becomes lewd. Okay, that's a lie, everything is lewd.