If you’re away from your computer and it tells you that you’ve got mail (visually), isn’t it useful? A simple USB connected projector reflects simple info against the wall, ceiling or desk. If your desktop is filled with lots of windows, it might be helpful if a “Meeting starts in 5 min!” message suddenly appears on the wall. Or if you’re concentrating on something so much you don’t want anyone to talk to you, you can say “Do NOT Disturb” without having to actually say anything.

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