This is my fortress:-
See the strong tall walls I built to keep my enemies out;
See the arrow-slits and cannon-ports through which I could attack my enemy;
See the sturdy gates through which I could admit my friends;
All this I built lovingly over many years to keep me safe.
This is my fortress!
This is my prison:-
I built the walls so high I cannot scale them;
I placed the arrow-slits and cannon-ports so high up that no-one can see in;
I locked the gates so long ago that I have lost any keys I ever had.
This is my prison!
I have sentenced myself to life-imprisonment for crimes against myself.
I am desperately seeking parole.
I must be fecking mad.