Milan Grygar has been exploring the specific concept of relations between visual and acoustic in very diverse and often contradictory parallels for more than five decades. The fact that in the context of the Czech art scene Grygar is absolutely remarkable, is influenced by his interest in experimental music and the follow up of the development of international inter media tendencies based in the contemporary avant-garde music (beside the system of free atonality of Arnold Schoenberg, we can mention the Notation of New Music by Erhard Karkoschka and the aleatoric concept of John Cage).