The 11th dimension is a mysteriously absurd place that's not really a place at all. No. It came about when reality got really drunk, majored in theoretical physicals, and then started granting inappropriate wishes, among other things.
For instance, the 11th dimension is where nebulous and terrifying concepts often become wildlife, and are set loose upon the other dimensions all willy-nilly and whatnot. Don't get the wrong idea here. These creatures are not anything as fully formed genuine ideas.
Look over there. We have a prime example darkened the sky right now. That is a flock of probablys. They might look harmless, but don't look them in the eye.
Often you might even see a causality hunting loose coincidences. And you should watch out for the cognitive dissonances that traipse about in the nude.
You'll find some bureaucracy manifesting as a moldy infestation if you go deep and dark enough. It's rather wet down there, and it stinks. Avoidance is probably best, really.
Mind the mosquito-like déjà vus if you're hunting for rare metaphors, and don't expect to leave with the same amount of sanity as you once had prior to your visit.
Keep these things in mind, or in a nearby bucket, and you'll be fine. Probably.