That type of line is called contradiction. A straight line drawn across a corner, as in figure Fig.3.20 (C), is so sudden and a sharp contrast that it cuts off the corner harshly. When a horizontal and a vertical line come together as in a right angle or a corner, these lines are in opposition to each other and form aFig.3.20 (B). When a set of lines is drawn within a corner, following the lines of the corner, repetition occurs Fig.3.20 (A). Harmony in lines through transition, which soften or modify the other.Harmony in lines which contrast with one another.Harmony through repetition of lines in a composition.The types of lines in a composition can be reduced to three main groups: In any composition principles of harmony have five aspects of harmony: (1) line and shape, (2) size, (3) texture, (4) idea, and (5) color. When all the objects in a group seem to have a strong "family resemblance," that group illustrates the principle of harmonious selection and when these "friendly" articles are so arranged that the leading lines follow the shape of the object on which they are placed, Harmony has been secured in both selection and arrangement. Harmony is the art principle which produces an impression of unity through the selection and arrangement of consistent objects and ideas.
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