For instance, a cheetah is generally considered to be fast. But a cheetah is quite slow compared to a jet airplane. So saying “a cheetah is fast” is only meaningful when some relevant context is also communicated or assumed. Likewise, stating that “element X in the page layout is important” is only meaningful when the relative importance of that and all other elements has been established. In other words, every element on the page you’re designing has to be positioned, styled, sized, or otherwise distinguished in accordance with its specific importance and place in the overall communicative objective. If you neglect even one component, it may work to subvert your entire effort.
— A List Apart: Articles: Contrast and Meaning
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