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I think it's mostly because it's out of the norm. While we don't tend to focus on cross-eyed people as something 'special', we do that with other physical differences in humans. For example, people who are missing a limb and yet still do something incredible.... or midgets.... or people with really interesting colors (like albino or a strange eye color).
We're fascinated by the "weird." When it comes to cats, most are pretty standard and there's not a whole lot of deviation besides color, hair length, and a bit of size differences. To have one that's cross-eyed, though? That seems pretty out of the ordinary. The same goes for a lot of other animals.
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