Subject: Two possible answers
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Posted on: 2010-09-14 14:58:00 UTC

The Thoughtful Answer

Think of the canonical universe as the two faces and the alternative universe as the vase. All it takes to go from one to the other is a change in perspective, which is provided by the fic author. Good AUs make the illusion work, whereas poor AUs give you headaches. The DIAU agent's job is to cull out the weak realities (badfics) and leave the strong ones (goodfics) be.

The Not-So-Thoughtful Answer

It represents the same thing as a cactus does for the Department of Mary Sues.

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