> Similarities don't mean anything ...beyond the similarities themselves, that is. > It's the differences that count to distinguish things By definition. But

> Similarities don't mean anything ...beyond the similarities themselves, that is. > It's the differences that count to distinguish things By definition. But then again, if I'm comparing the impact of two dictators, it's probably not helpful to point out that they had different hair colors. I think what you're really saying is that in a particular context, some properties are relevant, and others aren't. There's no point in pointing out that irrelevant properties are shared, but equally there's no point in pointing out irrelevant properties that are different. In other words, people just have to be clear about what they're talking about.