And I think that's something actually that Justice Kennedy strives for that he wants the jurisprudence of the court not to be abstract - legal rules or policies that are separate from the human condition.

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But fluid intelligence, the ability to analyze abstract situations involving novel sets of rules, plays an outsize role.

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In his eyes, Greenberg was a moralist in art who laid down rules about how a proper modern painting should look: as abstract and flatly painted as possible.

ECONOMIST: Contemporary-art criticism