All the other arts whose object is to give pleasure, as the drama, dancing, etching, are either modifications of one of the fine arts, or combinations of two or more of them. In recent times it has been held that poetry is a combined art, owing to the almost invariable use of a simple form of music in its construction, but it would appear that primarily poetry is independent of metrical assistance. This was clearly laid down by Aristotle, but modern definitions of the art have usually included some reference to metre.[20] Now in our common experience two things are observable in respect of poetry. The first is, that when by way of admiration or criticism, we discuss the works of those poets whom all the world recognizes as the greatest known to us, we deal only with the substance of what is said, and the manner of saying it, without reference to the metrical form. In the second place we observe that the higher the poetry, the more simple is the metrical form with which it is associated. The great epics, which necessarily take first rank in poetry, have only metre, the higher musical measures in which lyrics are set being avoided. But as we descend in the scale of the art, metrical form becomes of more importance, and when simple subjects are dealt with, and a grand style is inappropriate, the production would not be called poetry unless in the form of verse. [Illustration: PLATE 6 (See page 116) The Reposing Venus of Giorgione (_Dresden Gallery_)] In epic and dramatic poetry, we call one poet greater than another because of his superior invention and beauty of expression, let the measure be what it will. But the invention comes first, for only high invention can be clothed with lofty expression. The actions of deathless gods or god-like men; qualities of goodness, nobility, courage, grandeur, so high as to be above human reach: only these can form the subject of language and sentiment soaring into regions of the sublime, and indifferent to metrical artifice. In the sacred books of all great religions we may find the loftiest poetry without regular form, and any prose translation of the Greek poets will provide many examples,[21] though often there is a cadence--a rise and fall in the flow of words which is more or less regular, and has the effect of emphasizing the sentiment, and of throwing the images upon the mind with directness and force. We must conclude then that in poetry, while metrical form is generally essential, it is not vital to the highest flights of the poet, and so strictly, poetry is primarily a pure and not a compound art.