"Well, we all have a face that we hide away forever
And we take them out and show ourselves when everyone has gone.
Some are satin, some are steel,
Some are silk and some are leather.
They're the faces of a stranger,
But we love to try them on."
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Elphaba's Stranger was silk. Glinda had seen it once or twice. When Elphaba was deep in sleep, when Glinda was teasing a lock of hair from Elphaba's braid, when Elphaba was stealing a kiss from Glinda's rosy lips. Elphaba was harsh and jagged where the Stranger was soft and smooth. Glinda loved them both.
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Glinda's Stranger was steel. Elphaba had only seen it once. It had been when Elphaba was studying hard. Glinda had grabbed Elphaba's book from under her nose, a library book, and ripped out every single page in a fit of rage. The Stranger had that famed Gillikinese temper while Glinda seemed very patient about most things. Elphaba could never leave either of them.