'''Black cube''' may refer to: * Black Cube, a private intelligence agency * Black Cube Nomadic Art Museum, a nonprofit contemporary art organization producing site-specific art in the public realm. * Blackballing, a vote of rejection in a secret ballot * The Kaaba, a black cubical building at the center of the Grand Mosque of Mecca; it is the most sacred site in Islam * Tefillin, a small black leather cube used by Jews during prayer
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