Behind the curtain
Referring to a stage curtain, Lady Gaga wants to know if this boy wants to discover what her life is off-stage.
This also refers to “The Wizard of Oz” (a common reference throughout ARTPOP) and the wizard, who manipulates others into believing he is possesses magical powers from behind a curtain in the Emerald City.
Gaga is asking this boy (or us, her audience) whether or not we want to have her beautiful illusion (public persona) dispelled in exchange for the truth (the artist beneath it all).
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