Indeed, we communicate with other people in vernacular but sometimes, we use signs to express our opinion in our normal life too. Like we ask someone whether or not he is agree with us on certain issue. He may say yes or no and may explain too, but you may notice that he just nod his head for yes no and we understand it what he wants to say. Likewise if someone is standing at a distance and we can use signs to convey our message and we understand these signs while exchanging to each other. But the author has raised the issue of the signs as a medium of language which is used between those people who are not able to speak or communicate. These signs are their medium of communication. If we get in touch with them for a long time we will start learning their thought or communication up to some extent even without learning their language.