They were speaking of a sense that we all have, and that is fundamental to our functioning in the world. They were talking about our sense of balance. The fluids and bones of the inner ear mediate the sense of balance. You only have to think of the impact on your life of damaging your sense of balance—through illness or alcohol—to get some idea of how important it is to our everyday existence. Yet most people never think to include it in their list of senses. This isn’t because they don’t have a sense of balance. It’s because they’ve become so accustomed to the idea that we have five senses
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