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One Cuil, denoted by the Interrobang symbol (‽) is equal to One Level of Abstraction or Surreality away from the reality of a situation.
A complex scale of Cuils exists, with Positive Cuils (‽) representing Surreality and Negative Cuils (-‽) representing hyper-reality. An imaginary scale of Cuils is also theorized to exist, with the function of correlating relationships between the positive and negative axis.
http://store.xkcd.com/reddit/#Cuiltheoryposter
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Details have been posted to the original commentary in reddit containing joining this site. As of now, anyone can post on the forums, and anyone who wants can register and start editing the Cuil Theory wiki.
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I will try to migrate all your great comments to the wiki. In the meantime: