Even Spock's most famous gesture, that single raised eyebrow of his, is an expression of puzzlement or condescension. Course, he always claimed to have emotions under check rather than wiped out.

I like the idea of Kai as an properly emotionless rationalist. A robot. My friend just called hist newborn "Kai" but he's never seen Lexx.

I often figure that if you take emotion away from people you get Abulia rather than rationality anyway.