Just as radio stations send out radio waves, so the human mind sends out mind waves. The waves of the mind spread out in all directions of space. If a son who is far away in Seoul is sick or worried about something, his mother can sense such conditions through intuition or feel it through her dreams. This is the simultaneous transmission and reception of mind waves.
— Jae Woong Kim, Polishing the Diamond, Enlightening the Mind by Jae Woong Kim, Yoon Sang Han, translator