I see your brain, with grooves and all, an explosion of colors instead of a boring grey hue. I can only imagine the things that go on inside your mind - a party of thoughts and ideas. The potential is limitless. You could conquer the world. Hell, you could build a rocket if you want to.
But wait, what's that dark cloud swirling around your brain? A thick smoky wall of darkness that's preventing your good colors from spilling out? It's overpowering your mind, the colors are barely showing. The colors are trapped. How can you get rid of it?