What do you find to be the most fascinating aspect of the brain and/or mind?

Our consciousness and how we can learn anything we set our minds to. Our brain is how we adapt. We don't need physical adaption in order to function in various environments. Our brain can get creative and think of ways to solve that issue. Such as building and using planes to fly, or ships to cross bodies of water. I think it's fascinating that we have that ability. It's not instinct that drives us, it's learning and memory that allows us to do the things we do.