The portrait class is an especially interesting object for study, inasmuch as while its general type is very simple and constant, for this very reason the slightest variations are sharply felt, and have their very strongest characteristic effect. The general type of the portrait composition is, of course, the triangle with the head at the apex, and this point is also generally in the central line; nevertheless, great richness of effect is brought about by emphasizing variations. For instance, the body and head are, in the great majority of cases, turned in the same way, giving the strongest possible emphasis to the direction of attention,--especially powerful, of course, where all the interest is in the personality. But it is to be observed that the very strongest suggestion of direction is given by the direction of the glance; and in no case, when most of the other elements are directed in one way, does the glance fail to come backward. With the head on one side of the central line, of course the greatest interest is removed to one side, and the element of direction is brought in to balance. Again, with this decrease in symmetry, we see a significant increase in the use of the especially effective elements, vista and line. In fact, the use of the small deep vista is almost confined to the class with heads not in the middle. The direction of the glance also plays an important part. Very often the direction of movement alone is not sufficient to balance the powerful M.+I. of the other side, and the eye has to be attracted by a definite object of interest. This is usually the hand, with or without an implement,--like the palette, etc., of our first examples,--or a jewel, vase, or bit of embroidery. This is very characteristic of the portraits of Rembrandt and Van Dyck. In general, it may be said that (1) portraits with the head in the centre of the frame show a balance between the direction of suggested movement on one side, and mass or direction of attention, or both together, on the other; while (2) portraits with the head not in the centre show a balance between mass and interest on one side, and direction of attention, or of line, or vista, or combinations of these, on the other. Still more unsymmetrical in their framework than portraits, in fact the most unfettered type of all, are the genre pictures. As these are pictures with a human interest, and full of action and particular points of interest, it was to be expected that interest would be the element most frequently appearing. In compositions showing great variations from geometrical symmetry, it was also to be expected that vista and line, elements which have been noted comparatively seldom up to this point, should suddenly appear strongly; for, as being the most strikingly "heavy" of the elements, they serve to compensate for other variations combined.