I am trapped in a cage. I made it myself. You would not expect anything less, I am sure.
It is nice and safe. It is hard to hurt me when I am behind these thick, strong bars that I made (ironmongery of the mind is one of my many talents). I have spent years forging them just so; they contain me.
I suppose that trapped isn't really the right word - I can get out of it. It's just that the door in the cage is very high on one of the walls.
When I get there I can either go straight ahead into another cage (tunnel-shaped; getting narrower), or jump into the unknown and see what happens. It is dark outside my cage; it could be a long fall and there may be nobody there to catch me, just people cheering me on from afar.
There could be another cage where I land. This cage could be less comfortable and safe.
I am building steps out of my cage. Once I get within grabbing distance of the door, though, it will be time to take action. I am building the steps slowly so that this does not happen too soon. As I said, it is safe within my cage.
My cage is not bare. There are plenty of playthings. They do not melt the bars, though.
My cage is portable. It won't go very far, but it does not have to stay in exactly the same place: some variety is permitted, although not welcomed. The doors have to be padlocked shut to facilitate any moving, and it is a while before they will be opened again.
I can still build the steps while I am waiting, though. I can stand at the door and try to gauge what will happen when I step through.
I actually feel as though I might explode. If this were not impossible, I would be mildly concerned. There would be limbs everywhere. People might trip.