When considering the use of a principle, you might want to look at still ads that have successfully applied the principle. Ogilvy had suggested copying the styles of advertisers that you thought to be effective.
Looking at ads that violate the principle will help you to extend your understanding of how the principle should be applied. To do this, go to the principle that you are considering and select ads that “comply” to see a good application of the principle, and select ads that “violate” for a bad application.
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