The following is my second draft:
Would you call your day normal?
Take a peek outside. The sunlight blasts your face. Your eyes start to water. After you adjust to the light, take a look around your street. What do you see? Neighbors walking dogs, boys playing basketball, workers returning to home. The same thing you see everyday.
It's almost painful, isn't it? The perpetual gnawing of the mundane on your psyche, the lack of escape from the everyday. You'd prefer horror to anything that bores you. I can tell. I have a certain sense for such matters.
You can retreat if you like, return to your little world of ignorance. Fine, fill your ears with the noise from your earphones, burying your head in another book. You hope the music will drown out my incessant blabbering, don't you? I'm afraid it will not.
I know you're wondering who I am, aren't you? To your kind, I would be considered a spirit; something intangible and invisible. However, I am just as corporeal as you are. I simply reside somewhere beyond the limits of your perception.
Now, you must be wondering why a being such as myself would be speaking to a lowly human. You see, living a life where an entire species of creatures is oblivious to your existence can often become boring. This life, when increased to the thousands of millennia of my existence, can be very tiresome indeed.
Let me explain. Consider a line. A space of one dimension. If we add one, you get squares and circles. Add yet one more, and you get cubes and spheres. This is the extent of both your world and your imagination. But what happens if you add another dimension? Two more? Ten more?
Let me make you an offer. If you unplug your ears for just a short moment, I will free you from the mundane. That's what you wanted all along, wasn't it? That's why you seclude yourself in this little corner, with no asset other than a labyrinth of books and your computer. You want some freedom from the normal world. From the mundane.
Don't be so stubborn. I realize that you wouldn't normally head the words of a little voice in your head that, as far as you know, came from nowhere. But for just this once, let fantasy and wonder have their way. For you to resist them would be a paradox.
Finally. Thank you for complying. Now, I want you to take a look around your room. Appears the same, does it not? Let me remove one of the walls. Do you see it? A mirror image of the room, and then another, progressing on for infinity, right where the wall used to be. You're in there, too. Moving about in a countless number of rooms. Step into one, if you wish. They may all look similar, but I assure you that there is a difference.
Each one of these is one second in the future, all coexisting in the same instance. Lift up your hand in one, and you will see yourself putting it down in another. It functions likewise for the past.
I wouldn't recommend you go very far, though. Not all beings in this space are as friendly as me. If these beings see that you are aware of there existence, and you can travel as freely as them, they will not take very kindly to it.
For now, return to your original location. I'll seal up that wall for you. Keep in mind that that was merely a glimpse of my world. I had to remove some part of the space, just to insert a section of some higher dimension. If I didn't, you would indeed have a very confusing time calculating both your world and a whole new reality.
Now, why don't you take a little trip outside. All those people you saw have company now, don't they? I wouldn't recommend you look very long. The black figures, the non-Euclidean geometry, and the sprawling limbs typically don't have a very pleasant effect on viewers. I would recommend you keep a straight face, as well. They don't like being noticed.
See that one man, with the macabre mass hanging off his shoulders? I would recommend you stay away from him. These things don't have a very good influence on people.
Did you notice that one approaching you? I recommend staying nonchalant. Even if it touches you, make sure you do not fret. Speaking of staying casual, why don't you slowly take a stroll down the sidewalk? I said slowly. Such routine actions tend to ward off these creatures.
You see, the mundane is a little more useful than you first thought. It acts as a barrier between our world and theirs. Take the everyday away, and you will not have a very enjoyable experience.