fourth wall

noun Theater.
the imaginary wall of a box set, separating the actors from the audience.

Origin:
1800–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Rooms are plush and many have no fourth wall, revealing views of the ocean or
  the countryside.
The fourth wall of the television makes far too many of us spectators rather
  than participants.
Each unit sleeps up to six people and has three concrete walls, a canvas roof
  and a fourth wall covered by a curtain.
Three smooth walls, painted pinky-beige, the fourth wall broken only by the
  well-sealed window.
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