In general, graphics should be greater in length than in height unless the nature of the data suggests otherwise. Tufte (2001) suggests that graphics be about 50% wider than tall. He uses the horizon as an analogy; our eye is naturally practiced in detecting deviations from the horizon, he says, and graphic design should take advantage of this fact. Furthermore, horizontal graphics can more easily be labeled. It is easier to write and read words that stretch horizontally from left to right, rather than vertically.
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