They were superb sailors, insatiably curious, and unusually suspicious of individuals with any kind of power. They were deeply competitive, masters of the spoken word, enjoyed laughing so much that they institutionalized comic theater, and were addicted to pleasurable pastimes. Yet the feature of the Athenian character that underlies every aspect of their collective achievement is undoubtedly their openness—to innovation, to adopting ideas from outside, and to self-expression.