Been playing now for over 30 yrs, have read and own many books on pool,and have seen reference to a "ghost ball" which I understand. My first exposure to "Playing the Ghost" was on this forum. I have concluded...perhaps incorrectly.....that the Ghost is an imaginary player you envision while practicing. Was this imaginary entity first introduced in a training manual, or on a DVD. Please excuse my ignorance on this subject and enlighten me......I'm afraid of the dark.......Dan