During the process you use your sense of touch to develop an image in your mind of the wall’s surface and make a better guess for where the switch is.
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Vision and hearing are so crucial to our daily lives that any impairments usually become obvious to an affected person. 
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Artist Neil Harbisson is completely colour-blind. Here, he explains how a camera attached to his head allows him to hear colour.
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Since the days of the ancient Greeks, scientists have wondered why the ear prefers harmony. Now, scientists suggest that the reason may go deeper than an aversion to the way clashing notes abrade auditory nerves; instead, it may lie in the very structure of the ear and brain, which are designed to respond to the elegantly spaced structure of a harmonious sound.
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Speakers who are not the focus of attention are 'not even heard'.
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The timing and frequency of vibrations produced in the skin when you run your hands along a surface, like searching a wall for a light switch, play an important role in how we use our sense of touch to gather information about the objects and surfaces around us