### Using Proportion

Most designers rely on their intuitive sense of proportion in approaching a poster. When our intuition hits a roadblock, however, the principles of proportion can be very helpful in determining the correct division of space within a layout. Let's look at some basic ones now.

#### The Golden Section

The golden section, discovered by the Greeks in the fifth century B.C., was once referred to as a “key” to proportion. The golden section is a ratio that divides a whole into two segments so that the smaller segment has the same proportion to the larger that the larger has to the whole. This can be expressed algebraically as a:b = b:(a+b). The sides of a golden rectangle have a proportion of 1:1.618.

##### Figure 6.20. To construct a golden rectangle, ...

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