Wave & Show is a way to get someone's attention across a room (or any space). Bright flashing big letters (caps but you can disable that) of your message are visible for quite a long distance. By typing a simple text message and waving it in the air in a downward to upward motion you can have your message read by the person opposite you. It is drawing upon the basic principles of persistence of vision that allows you to read the message written.
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