Medium is the massage

People are full of Ideas and thoughts that we acquire all the time. We are not empty on the inside however if we have no way to output whattever we have within us then all this potential and all these thoughts they disapear in vain. "we are helped by what is not, to use what is" McLuhan. With the need for an outlet of our thoughts, ideas and emotions mediums were invented. Hollow mediums that are filled with our human substance. Without it books would be nothing more then blanck pages, and language would be nothing more then an assembly of meaningless sounds. I think this is what McLuhan is trying to show in his book, that media is what defines us as humans because all media are outlets of what we have inside, therefore it is the message.