We interface with the world through our five senses. In a way, though, we really have one basic sense, touch. All the other senses are a type of touch. We touch light waves with our eyes, we touch sound waves with our ears, and so on. The neurons that sense these things really notice two things. They either notice “on” or they notice “off”—that the phenomena of being “touched” is happening or not happening.
-- Bill Harris
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