Magic Mirror

Japanese: マジックミラー

〘Noun〙 ( Western word magic mirror) A semi-transparent membrane made by plating plate glass with silver or tin. When fitted to a window, the difference in brightness between the inside and outside allows the dark side to be seen from the bright side, but the bright side cannot see the dark side very well because of the high reflectance of external light. Magic glass. *Wild Beasts Must Die, Revenge (1960) by Oyabu Haruhiko, Cash Transport Truck "He cast his gaze at the front door of the magic mirror which could only be seen through from the inside."

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

〘名〙 (洋語magic mirror) 板ガラスに銀や錫鍍金をして半透膜にしたもの。窓などにはめると、内外の明るさの差により、暗い方から明るい方を見ることができるが、明るい方からは外光の反射率が高いため暗い方がよく見えない。マジックガラス。※野獣死すべし復讐篇（1960）〈大藪春彦〉現金輸送車「内側からだけ見とおすことの出来るマジック・ミラーの表戸に視線を放っていた」

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