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If you use tall, narrow columns in your newsletter, have a few strong headlines to create a contrasting horizontal direction across the page.
Combine contrast with repetition, as in the page numbers or headlines or bullets or rules or spatial arrangements, to make a strong, unifying identity throughout an entire publication.
Besides the contrast in the typefaces in this postcard, there is also a contrast between the long, horizontal title and the tall, narrow, vertical columns. The narrow columns are a repetitive element, as well as an example of contrast.
Source: The Non-Designer's Design Book by Robin Williams