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People don't give proprioception enough credit until they end up losing it. Proprioception is the sense of where in the world our bodies are.

I hold the belief that proprioception is more than a sense, but rather, part of what makes us conscious as it requires a sense of 'I'. Toddlers are able to identify themselves in mirrors, and it is usually preceded by movements, and identifying that "the mirrored human performs the same movements as I do", which requires some form of proprioception.

Oliver Sacks talks a lot about other senses beyond those covered in school. I can recommend "The man who mistook his wife for a hat", "Hallucinations", and "Awakenings".