234. Hence, we see the grand importance of the choice of our means of enhancing effect, and we derive the simple rule for that choice, namely, that, when we wish to increase abstract impression, or to call upon the sympathy of the spectator, we are to use contrast; but, when we wish to extend the operation of the impression, or to awaken the selfish feelings, we are to use assimilation.

This rule, however, becomes complicated, where the feature of contrast is not altogether passive; that is, where we wish to give a conception of any qualities inherent in that feature, as well as in what it relieves; and, besides, it is not always easy to know whether it will be best to increase the abstract idea, or its operation. In most cases, energy, the degree of influence, is beauty; and, in many, the duration of influence is monotony. In others, duration is sublimity, and energy painful: in a few, energy and duration are attainable and delightful together.

235. It is impossible to give rules for judgment in every case; but the following points must always be observed:—First, when we use contrast, it must be natural and likely to occur. Thus the contrast in tragedy is the natural consequence of the character of human existence; it is what we see and feel every day of our lives. When a contrast is unnatural, it destroys the effect it should enhance.

Canning called on a French refugee in 1794. The conversation naturally turned on the execution of the Queen, then a recent event. Overcome by his feelings, the Parisian threw himself upon the ground, exclaiming, in an agony of tears, "La bonne reine! la pauvre reine!" Presently he sprang up, exclaiming, "Cependant, Monsieur, il faut vous faire voir mon petit chien danser." This contrast, though natural in a Parisian, was unnatural in the nature of things, and therefore injurious.

236. Secondly, when the general influence, instead of being external, is an attribute or energy of the thing itself, so as to bestow on it a permanent character, the contrast which is obtained by the absence of that character is injurious, and becomes what is called an interruption of the unity. Thus, the raw and colorless tone of the Swiss cottage, noticed in § 42, is an injurious contrast to the richness of the landscape, which is an inherent and necessary energy in surrounding objects. So, the character of Italian landscape is curvilinear; therefore, the outline of the buildings entering into its composition must be arranged on curvilinear principles, as investigated in § 144.

237. Thirdly. But, if the pervading character can be obtained in the single object by different means, the contrast will be delightful. Thus, the elevation of character which the hill districts of Italy possess by the magnificence of their forms, is transmitted to the villa by its dignity of detail and simplicity of outline; and the rectangular interruption to the curve of picturesque blue country, partaking of the nature of that which it interrupts, is a contrast giving relief and interest, while any Elizabethan acute angles, on the contrary, would have been a contrast obtained by the absence of the pervading energy of the universal curvilinear character, and therefore improper.

238. Fourthly, when the general energy, instead of pervading simultaneously the multitude of objects, as with one spirit, is independently possessed and manifested by every individual object, the result is repetition, not unity; and contrast is not merely agreeable, but necessary. Thus, a number of objects, forming the line of beauty, is pervaded by one simple energy; but if that energy is separately manifested in each, the result is painful monotony. Parallel right lines, without grouping, are always liable to this objection; and, therefore, a distant view of a flat country is never beautiful unless its horizontals are lost in richness of vegetation, as in Lombardy, or broken with masses of forest, or with distant hills. If none of these interruptions take place, there is immediate monotony, and no introduction can be more delightful than such a tower in the distance as Strasburg, or, indeed, than any architectural combination of verticals. Peterborough is a beautiful instance of such an adaptation. It is always, then, to be remembered that repetition is not assimilation.

239. Fifthly, when any attribute is necessarily beautiful, that is, beautiful in every place and circumstance, we need hardly say that the contrast consisting in its absence is painful. It is only when beauty is local or accidental that opposition may be employed.

Sixthly. The edge of all contrasts, so to speak, should be as soft as is consistent with decisive effect. We mean, that a gradual change is better than instantaneous transfiguration; for, though always less effective, it is more agreeable. But this must be left very much to the judgment.

Seventhly. We must be very careful in ascertaining whether any given contrast is obtained by freedom from external, or absence of internal, energy, for it is often a difficult point to decide. Thus, the peace of the Alpine valley might, at first, seem to be a contrast caused by the want of the character of strength and sublimity manifested in the hills; but it is really caused by the freedom from the general and external influence of violence and desolation.