Besides these, the commonest effects in music are produced in a purely physical manner by strength of sound, especially in an orchestra. Such are some of the most usual effects in the various arts, but there yet remains one common to them all, namely, to convey by means of one art what it would be natural to convey by another: for instance, to make music describe (as is done by the programme music of Wagner and his followers), or to make painting, the drama, or poetry, induce a frame of mind (as is aimed at by all the Decadent art). The fourth method is that of interesting (that is, absorbing the mind) in connection with works of art. The interest may lie in an intricate plot—a method till quite recently much employed in English novels and French plays, but now going out of fashion and being replaced by authenticity, _i.e._ by detailed description of some historical period or some branch of contemporary life. For example, in a novel, interestingness may consist in a description of Egyptian or Roman life, the life of miners, or that of the clerks in a large shop. The reader becomes interested and mistakes this interest for an artistic impression. The interest may also depend on the very method of expression; a kind of interest that has now come much into use. Both verse and prose, as well as pictures, plays, and music, are constructed so that they must be guessed like riddles, and this process of guessing again affords pleasure and gives a semblance of the feeling received from art. It is very often said that a work of art is very good because it is poetic, or realistic, or striking, or interesting; whereas not only can neither the first, nor the second, nor the third, nor the fourth of these attributes supply a standard of excellence in art, but they have not even anything in common with art. Poetic—means borrowed. All borrowing merely recalls to the reader, spectator, or listener some dim recollection of artistic impressions they have received from previous works of art, and does not infect them with feeling which the artist has himself experienced. A work founded on something borrowed, like Goethe’s _Faust_ for instance, may be very well executed and be full of mind and every beauty, but because it lacks the chief characteristic of a work of art—completeness, oneness, the inseparable unity of form and contents expressing the feeling the artist has experienced—it cannot produce a really artistic impression. In availing himself of this method, the artist only transmits the feeling received by him from a previous work of art; therefore every borrowing, whether it be of whole subjects, or of various scenes, situations, or descriptions, is but a reflection of art, a simulation of it, but not art itself. And therefore, to say that a certain production is good because it is poetic,—_i.e._ resembles a work of art,—is like saying of a coin that it is good because it resembles real money.