"""(Personally, I don't trust "I think therefore I am" even in real life, since it contains a term "am" whose meaning I find confusing, and I've learned to spread my confidence intervals very widely in the presence of basic confusion. As for absolute certainty, don't be silly.)"""

I'm just wondering, what do you think of the Ultimate Ensemble? If I'm not mistaken (I only read the Wikipedia article), it applies to existence your rule that if there's no difference, there should be no distinction.