High Quality Content by WIKIPEDIA articles! OH Cards are a genre of special playing cards used as story–telling prompters, counseling and psychotherapeutic tools, communication enhancers, educational aids, and social interactive games. OH cards have no official or traditional interpretations of images, and instructions included with the decks encourage imaginative and personal interpretations of the images. Usually these images are small paintings created by various artists specifically for this kind of use. As a genre, OH cards are unconventional "information containers", unbound books with no set sequence of pages.