<quote>

We’ve already looked into the problem of judging between reality and made-up stuff, but we haven’t defined the fundamental difference. Reality is what exists. It’s what’s real. A concept is a story about what exists, and this story also contains made-up stuff or at least parts that we can’t prove to be real. And so we return to the question of sanity.

Here’s a one-question sanity test:

Is it sane to make up stuff and insist that the made-up stuff is true?

</end quote>

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