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 entailed by as many as five changes of scene. The actual mechanism employed by Jones to obtain his effects is perhaps better known to us for this later period, in view of the numerous plans and designs preserved at Chatsworth and elsewhere, than for the earlier one. The action of a mask was in all cases 'continuous', and therefore he was happily debarred from the awkward modern convention of a drop-curtain. Jones ultimately worked out a system of back-cloths and shutters or flats, arranged and painted so as to produce a perspective and an illusion of solid scenery. These ran in horizontal grooves, so that those belonging to one scene could be placed close behind those belonging to another, and each set could be successively removed by lateral withdrawal. It was, in fact, a multiplied use of the primitive 'traverse' or sliding curtain. This system may have already been at his disposal in the Jacobean period; it was well adapted, in particular, for the splitting of a rock. But it is clear that he also used a device based upon a different principle, a machina versatilis, which by means of a circular motion was capable of displaying successively the different faces of a comparatively solid decorative structure placed upon it. Jonson applies the term ''machina versatilis to the House of Fame in the Mask of Queens''. Presumably the rotating globe in Hymenaei and the rotating throne of Beauty in the Mask of Beauty are other examples; and yet another is furnished by Tethys' Festival, where however the truc was used, not to carry scenery, but to cover a change of scene by directing the attention of the spectators to three whirling circles of lights and glasses. It is hardly necessary to dwell upon such subsidiary devices as the trapdoors in the floor of the stage, or the pulleys by which floating clouds were let down from the heavens, for such obvious and primitive machinery had been familiar, long before the advent of Jones, as an element in the rudimentary technique of the popular theatre.

The approximation of mask to drama entailed by the adoption of the concentrated setting was not the only point of interaction between these parallel forms of mimesis. In the first instance it was perhaps the drama, rather than the mask, which underwent an influence. The various forms of spectacular entertainment with which the mask became entangled during the fifteenth century might be introduced at more than one moment in the long story of a Renaissance festival. They were equally well adapted to enliven the