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An ordinary digital picture frame cycles from one picture to
the next on a timer.
The Weeping Angel digital picture frame incorporates a small
camera, and a computer chip smart enough to determine how
many people are looking at it at any given time.
Whenever the number of people looking at
the picture frame
becomes zero, the picture is cycled to the next one.
Naturally, the device comes preloaded with images of the
Weeping Angels from Dr. Who.
Prior Art ... [8th of 7, Jul 02 2017]
The Dark Mirror
The above link reminded me of this [notexactly, Jul 05 2017]
||This reminds me of a related idea I've had for a while
but never thought to put it on my list of things to
halfbake because I was initially considering it as an idea
to fullbake, but that's now out of the question. So
thanks. Maybe I'll get around to posting it soon. I've
noted down your idea as prior art.
||Gaze detection is used for some smartphone applications (e.g., pausing a video when the viewer looks away). Should be a simple matter to write a variation to do this.
||8/7, Nowadays, "sympathetic ink" is a bit hard to come by,
and we must make do with technology.