My mind seems to roam. I can be right in front of you, engaged in a conversation with you, and yet, sometimes, i will remember nothing of what just happened. Most of the time i see images in my head that are similar to movies, or shows. Not necessarily random. It's almost like my brain is simply turning my thoughts into images and sounds in my head. Then it is up to me if i would like to make those thoughts reality, if it is even possible in humanitie's current stage of development. 99.9% of the time i am in full control of the imagery in my imagination. However, that .1% can get a little out of hand...
Philosophy of the mind --- Wikipedia