Because of their close adherence to sources and their distinctly expository purpose, the medieval dramatists made little or no distinction between what was suited for the stage and what was not. Their duty was primarily to present the narrative; and, though individual initiative might add something interesting or amusing, nothing in the Bible seemed unsuitable to presentation on the stage, and nothing that would aid its meaning seemed unsuitable for a drama. There was no thought of restricting a play to the presentation of one crisis or a single action, and there was consequently no possibility of an approach to anything like the structure of classical tragedy. The dramatist might take advantage of the dramatic value of a given situation like the sacrifice of Isaac, or he might make a series of plays lead up to the great events of the redemption, but he was blind to any opportunity to abstract from the narrative the events that dealt with an emotional crisis and to focus them upon that as the centre of a dramatic structure. There was no notion whatever of the difference between a narrative fable and a dramatic fable. Dramatic unity and values in a miracle play, on the tragic side at least, were usually the direct results of the narrative; unity on a larger scale in the cycle was the unity of history or of exposition, not of the drama. Such was the form which the Elizabethan drama inherited, and to the end the form of Elizabethan tragedy continued a development from medieval tradition and practice, not only in its failure to adopt the unities, the chorus, and other peculiarities of classical structure, but, more essentially, in its continued inability to restrict the story provided by a narrative source to the limits of a dramatic fable. Its final attainment of an organic structure, though promoted in part by the regularizing influence of classical theory and example, was in the main conditioned by the absence of dramaturgical restrictions, permitting an epic variety of events, the lack of which Aristotle had lamented in Greek tragedy, and by the consequent opportunity for a free and characteristic development. From the medieval drama the Elizabethans inherited not only dramatic form, but an entire method of stage presentation different from the classical. The typical medieval stage, whether in the form of the procession of pageants or the inclosed place with the stations for the various actors, had, indeed, given way to something much more like the modern platform, even before the production of "Gorboduc"; but in most particulars, in the importance placed upon costume, the historical anachronisms, the crudity but frequency of spectacle, and especially in the entire liberty as to what should be presented, medieval ideas still prevailed. In the miracle plays, heaven, hell, God, the devil, Noah's flood, the fall of Lucifer, and the Maries at the cross were all acted. The Elizabethan theatre showed scarcely less temerity.