A twentieth-century analog to this sixteenth-century practise can be seen in the spectacle presented in our modern three-ringed circuses--the 'Cleopatra,' for example, which was the opening number on the Barnum and Bailey program not long ago, where the Roman troops and the Egyptian populace came down from the stage and paraded around the arena. Bacon in his essay on 'Masques,' used the word "scenery" as tho he meant only decorated scaffolds, perhaps movable; and his expression of desire for room "to be kept clear" implies the use of the body of the hall for the maneuvers of the performers. Ludovic Celler, in his study of 'Mise en scène au dix-septième siècle' in France, shows that the action of the court-ballet was sometimes intermitted that the spectators could join in the dancing, as at an ordinary ball. In the earlier Italian open-air festivals, and in the earlier French court-ballets there was not even a proscenium sharply separating the stage from the rest of the hall; but in England by the time of Inigo Jones the advantage of a proscenium had been discovered, and we have more than one of the sketches which that skilful designer devised for his masks. But even then this proscenium was not permanent and architecturally conventionalized; it was invented afresh for every successive entertainment, and it was adorned with devices peculiar to that particular mask. Inigo Jones had also advanced to the use of actual scenery, that is to say, of canvas stretched upon frames and then painted. Mr. Hamilton Bell believes it possible that the invention of grooves to sustain wings and flats may be ascribed to Inigo or to his assistant and successor, Webb. Even in the Italian opera, where all the scenery was due to the brush of the scene-painter, there was for a long while a formal and monotonous regularity. Whether the set was an interior or an exterior, a public place or a hall in a palace, the arrangement was rectangular, with a drop at the back and a series of wings on either side equidistant from one another. This stiff representation of a locality is preserved for us nowadays in the toy-theaters which we buy for our children, altho it is now seen on the actual stage only in certain acts of old-fashioned operas. It lingers also in the variety-shows, where it is the proper setting for many items of their miscellaneous programs.