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A regular door viewer is a wide angle lens fixed to a
tube with another lens on the observer's side.
Simple, inexpensive, requires no power.
The BorgCo wall viewer is the same except the tube
is much, much longer and the optics are adjusted
The Wall Viewer is installed
in locations in a
dwelling where otherwise (due to the lack of
windows etc.) there is a "blind spot". Just drill a hole
through the wall, and fix the Wall Viewer into it. Et
||You forget that our earthbound cubes don't have freedom
to rotate in three dimensions. We'd be stuck looking at one
single spot - which, if it's interesting, will probably move; if
it doesn't move, it's probably uninteresting.
||Private investigators I'm told carry a hunk of plastic they can place on the outside of these door peep holes and change the optics to see inside the house.
||Maybe some sort of one way mirror would stop this means to invade privacy.