projection clock
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A projection clock (also called ceiling clock) is an analog or digital clock equipped with a projector that creates an enlarged image of the clock face on any suitable projection screen, most often the ceiling. They are not very complex, and can be built by hobbyists.
The advantage of a projection clock is that the "clock" can be placed almost anywhere, even on surfaces difficult to install traditional clocks on. They can also be moved easily, and depending on the projector used, the image can be in monochrome or color. The image generated by most projection clocks is large enough that a nearsighted person can see it from a distance without glasses or contact lenses, while an ordinary clock of similar size would be costly and impractical.
Projection clocks are also used in advertising and merchandising. High-brightness analog projection clocks can superimpose a business' logo on top of the clock face, while there are low-brightness projection clocks designed for Ferrari fans that project a Ferrari logo in addition to the time.
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