Most of the "one-way" glass that I have seen does allow someone outside
to look in, depending on the light. However, I know the technology is
there for a price. There is an expensive hotel in Hong Kong that has a
restaurant on an upper floor; from the restaurant, there is what appears
to be a mirror on one wall; the other side of that wall is the men's
room, and you can see right into the restaurant while using a urinal, in
case someone tries to steal your food, I guess. From the level of
construction and decoration in that hotel, I suspect the glass was quite
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