Ladders everywhere

I must have some sort of vertigo, though it does not seem to be the conventional kind. I mean, I can climb up ladders, literally, and even look down upon the ground. Yes, there is that dry feeling in the mouth and shivers down my spine and all that. I certainly would not prefer to cross over to the next building on a tightrope but, get this, my head does not start spinning nor do I feel the