One of the following is a cool medium of communication:

Television is the cool medium of communication in McLuhan's scheme.

A cool medium gives low definition and supplies little detail, so the audience must fill in and participate heavily to complete the message.

Television's grainy, low-resolution image demands just this active involvement from the viewer.

Print is a hot medium, high in definition and detail, leaving little for the reader to fill in.

A photograph too is hot, offering a complete, sharply defined image.

Radio is likewise a hot medium, delivering rich, high-definition sound with low participation.