h a l f b a k e r y
It's as much a hovercraft as a pancake is a waffle.
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A keyboard with a built in backlight or overlight which is motion activated when hands move over bottom bar of the keyboard, uses optical sensors like those used in burglar alarms or optical mouses.
||I find the glow from the monitor sufficient.
||The light is baked on my IBM T20, though not motion activated.