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John Carmack reviews your home's user interface.
(media.piefed.world)
People tweeting stuff. We allow tweets from anyone.
RULES:
That was my guess because the flat I live in (80s East German) has one just like that.
Living room could mean that there was the idea of a light for a dining table. Otherwise a power socket outside, on the terrace for example or an outside light? Garage door opener maybe?
If you really want to find out, I think you'll need to "play" around with your safety box and that particular switch