h a l f b a k e r y
This would work fine, except in terms of success.
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This wrist-carried timepiece has no dial or other overt display. It does have a touch-sensitive upper surface, and a concealed microphone.
On touching the watch, or on a spoken command, a scanning laser projects the time and date from a tiny window onto any available surface. Since it is a laser,
there is no focussing issue.
On the de Luxe version, there is an optional high power fixed beam cut/burn mode for pranksters and secret agents.
[xaviergisz, Aug 10 2017]
[hippo, Aug 10 2017]
Mentioned in my anno [notexactly, Sep 08 2017]
Mentioned in my anno. My thread. This one also incorporates a phone. [notexactly, Sep 08 2017]
Mentioned in my anno. Wall-mounted but similar. [notexactly, Sep 08 2017]
||Yes, [xav], seen that - but it only projects a few centimeters.
||The BorgCo product can project right across a street.
||To avoid tiresome litigation, can I suggest it has a
warning sticker (see link) on it?
||[hippo] nice but I hope that sticker isn't on your lab door.
||[8th of 7] By Douglas Adam's standards, are you sure you are not human?
||This, more or less, has been baked as crowdfunding scams:
[links]. The scammers were using some kind of magical dark
projectors, which this doesn't try to. However, the
projection angle problem still applies.