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keycap design

     This is an exploded diagram of a "rubberized" keyboard design. It enables the keycaps to have one clear label on them for normal use and a another label for use in "shift" mode. When the shift key is pressed, the LED lights up. The mask transmits the shape of the secondary label. The ink for the primary label is semi-transparent and the same hue as the LED. Therefore, the viewer sees a backlit secondary character when in shift mode. The mask is a complementary color, in practice it will be green. The primary label will be slightly less legible than a normally printed one, but this is a reasonable compromise: 1) since it's bigger, its lowered contrast has less of an effect, and 2) since the QWERTY layout is well-known, it's more important that the shift keys -- which are nonstandard -- are more legible.