Use Your Mind
Jot down what goes on in your mind. Tell us how the wheels in your brain turn in a fast / a slow motion, and tell us your Iq's and things that you think about all the time. It does not have to be personal.
You can add a twist of humour by describing the layout of your brain.
"Enter my brain. On the left is the part that thinks about things like my family and love, on the right side is the part where I think about problems and solve them, and straight ahead is a vacant room."
Or something like that. Just use your imagination.
Imagine how you could create a strong or fortified fort, surrounded by thick walls and ditches that makes it a fortification. Tell about the history of old defensive works, how they work, are build and defended throughout the centuries.