This study introduces one of the current positions of contemporary German theory and philosophy of media and mediality, which is negative media theory, as it was developed by the philosopher Dieter Mersch. This study also traces of certain fundamental historical preconditions for a philosophy of negative media theory from several different perspectives concentrating on the very core of mediocrity and mediality: on the concept of medium (the metaxy) , upon which Plato's Sokrates mediated in the dialog Theaitétos, as a special interposition of perception, which cannot be connected - neither with a subject, nor with an object, neither being, nor nothingness, but only in the perception which vibrate "in the realm between them" or the metaxy pheromenon.