TETRAD old media form -radio- it enhances audio communication- it reverses face to face speach- it retrieves orration and musical performance and it obsolesces it makes the absolute necessity for public orration obsolete.

An new form of media- mobile phones- enhances telephony communication- reversrees being incommunicable whilst away from lined communication - it retrieves the need for vocal communication - whilst making obsolete the inability to vocally communicate at long distances or when in a remote areas.