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I Spy..
A two-way
mirror (or spy mirror) is glass which, on one side,
provides a reflection, but on the other side, functions as a window.
It is used to observe people so that they are not
aware that they are being watched, or who is watching them. Two-way
mirrors (also known as one-way, transparent, and observation
mirrors) are not uncommon in police stations or psychological
institutions.
Two way mirrors are often only seen as
an invaluable
surveillance tool helping to save business thousands each
year from theft and shopping lifting. But are also a useful
observation tool. |