Talk:Epic Rap Battles of History 52/@comment-109.100.178.217-20150101102905/@comment-24310515-20150101192752

https://en.wikipedia.org/wiki/Fourth_wall

It's based on the three-walled box in theatre that's supposed to act as a room. Then there's the fourth wall which is the imaginary wall between the audience and the actors. Apparently that's where the term came from.

Learn something new everyday.