Thinking Man Silhouette SVG Picture
This web image is a silhouette image of a man thinking of something. Thinking is a human activity, which may be voluntary or involuntary. When the activity is done when a person sleeps, or when he is unconscious, such as a state of Coma, the action is said to be involuntary, as he does not have a control of his thoughts and mind. But he thinks of something when he is awake, and in full consciousness, this act is said to be voluntary, as he is in control of his thoughts and mind at the moment.