A one-way mirror, also known as a two-way mirror, one-way glass, or two-way glass is a mirror that is partially reflective and partially transparent. When one side of the mirror is brightly lit and the other is dark, it allows viewing from the darkened side but not vice versa.
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“The creation of strong-minded women, so-called, is due to the individualism of men, to the modern selfish and speculative spirit which absorbs everything within itself and leaves women nothing but self-assertion for their protection and support.”
—Jennie June Croly 18291901, U.S. founder of the womans club movement, journalist, author, editor. Demorests Illustrated Monthly and Mirror of Fashions, p. 44 (February 1870)