One way mirrors definitely do something, but a lot of what they accomplish is also due to maintaining dark on one side and light on another.

Dark and light are the keys to one-way mirrors

Though the words are linked through two simple connections. Books used to be big and heavy, so rather than travelling market stalls the first shops for books were in fact stationary - stationarius. And writing implements, paper and the like began to be sold at these stationary stores. Various sites will explain the history.

Stationary and Stationery

Always handy to be able to draw some quick sensible looking people. Worth practicing.

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6 simple sketch people