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A similar phenomenon occurs with the curved red roofs that are commonly found at McDonald’s. In fact, those slanted roofs generate 54% more business than more ordinary ones and, astoundingly, this is regardless of whether they’re topped with the golden arches or not. Now, if a few bubbles or a curve in a roof can make such a remarkable difference, there must an almost unquantifiable number of other signals that we’re subconsciously taking in every day.

Martin Lindstrom, from The Truth About That Mysterious, Sudden, Overwhelming Chocolate Craving