Poetry is one of the fine arts, and the fine arts admit of a division into Plastic and Rhythmic; the Plastic arts comprehending Sculpture, Architecture, and Painting, the Rhythmic arts, on the other hand, comprehending Dancing, Music, and Poetry. The chief points of difference between these classes are as follows. In the first place, the productions of the Plastic arts can be enjoyed by the beholder directly on their completion by the artist without the interposition of any help, while those of the Rhythmic arts demand, after the original creative artist has done his work, the services of a second or executive artist, who is usually termed the performer, in order that these productions may be fully enjoyed by the spectator or hearer. A piece of music requires a singer or player, a pantomime a dancer, and poetry a reciter or actor. In early times the function of executive artist was commonly discharged by the creative artist himself. In the second place, the Plastic arts have no concern with the relations of time; a work of painting or sculpture presents to the beholder an unchanging object or represents a single moment of action. The Rhythmic arts, on the other hand, are, in their very essence, connected with temporal succession. Dancing implies a succession of movements of the human body, Music a succession of inarticulate sounds, Poetry a succession of articulate sounds or words and syllables. The Plastic arts, therefore, may be called the arts of space and rest, and the Rhythmic arts the arts of time and movement. In this definition, it must be remembered, the intrinsic quality of the movements in each of these rhythmical arts is left out of account; in the case of poetry, for instance, it does not take into consideration the choice and position of the words, nor the thought expressed by them; it is restricted to the external characteristic which these arts have in common.