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Apple recently filed a patent application at the US Patent & Trademark Office to create a next-generation Apple Pencil that uses optical sensors.
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These sensors not only capture colors but also capture textures.
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The Apple Pencil's nib is equipped with a complex array of technology that would allow it to be more than a stylus.
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According to the patent drawings, the stylus tip contains a light sensor (and a light emitter) and a stylus tip.
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As you tap the Pencil onto any surface, the emitter and sensor combine to sample colors and textures.
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It works like a mouse that uses an optical sensor and light emitter to track movement.