explain the phrase the medium is the message
The medium is the message "The medium is the message" is a phrase coined by Marshall McLuhan meaning that the form of a medium embeds itself in any message it would transmit or convey, creating a symbiotic relationship by which the medium influences how the message is perceived.
A Wrinkle in Time The Happy Medium lives in a cavern on a planet in Orion's Belt. Human in appearance, she is described as wearing a satin gown and a silk turban, and uses a crystal ball to look at distant places and people. Her title comes from the character's jolly temperament, and her preference for looking at happy things. She helps Meg, Calvin, and Charles Wallace see The Black Thing through the crystal ball and understand what they are fighting against. She is introduced in chapter five. (The name "Happy Medium" is a pun alluding to the common expression for reaching an acceptable compromise: "to find a happy medium.")