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The technology is based on «microfluidics» — beneath the surface of a fairly ordinary-looking touchscreen are a number of channels that can be arrange in any pattern a manufacturer desires, and a small reservoir of fluid (a special type of oil that allows the channels to be invisible, for the most part). To form the shapes of the keys, a tiny amount of fluid is pumped through the channels, which raises a deformable membrane covering the surface of the touchscreen.



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