The saying is based upon the usual custom in modern offices of having senior management in glass-walled offices or cubicles, unlike lesser members of the company.
"in-glass." YourDictionary, n.d. Web. 18 January 2019. <https://www.yourdictionary.com/in-glass>.
in-glass. (n.d.). Retrieved January 18th, 2019, from https://www.yourdictionary.com/in-glass
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