Did you know that you're sitting on top of a pyramid?  That's the shape with four triangle sides and a square bottom like the ones you could find in Egypt.  The top is very pointy.  Sounds uncomfortable, right?  Well, being at the top of a pyramid is just where you want to be.  Not only do you get the best view, but the rest of the pyramid has to work to hold you up.  Oh, did I tell you that this pyramid is made of all the living organisms on the planet?  No, this isn't a circus act.  Let me explain . . .