There are 3 types of lines in a composition, lines which follow or repeat (a) one another, lines which contrast (b) with one another and transitional lines (c), which soften or modify the others (Fig.6.10).
If a curved line was drawn across a corner as in Fig.6.10.c, the sharpness of the opposition of the horizontal and vertical lines would be modified and that effect is transition. Curved lines make an easy transition from one straight line to another giving harmony instead of contradiction. A combination of lines results in shapes. The most harmonious shape that can be put into a rectangle is another rectangle of the same shape (Fig.6.11.a) and a circle makes the closest harmony with another circle.
Lines that oppose each other form contrasts in shapes look harmonious when they were arranged properly. One examples of these opposite or contrast shapes are triangle and diamond with in squares (Fig.6.11.b), oblongs and circles. Such combinations should be used where extreme contrasts are desired.
Transitional lines have a graceful softening effect and have the power to bring together in harmonious shapes (Fig.6.11.c). Transitional lines create shapes having variety with unity. In any arrangement where a number of shapes are used, there should always be an effect of organization.
Participants