Rule of Thirds
If the screen is divided into even proportions (halves, quarters), either vertically or horizontally, the result is generally pretty boring. For example, a horizon located exactly halfway up the frame should be avoided.
The rule of thirds is a useful aid to composing the picture. Divide the screen into thirds both horizontally and vertically (Figure 9.18). The main subject should be on one of those lines, or ideally, on the intersection of two of the lines. The rule of thirds suggests that the main subject should not be in the middle of the image (Figures 9.19, 9.20
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