  The Republic’s utopianism has attracted many imitators, but also many critics. The critics typically claim that Plato’s political ideal rests on an unrealistic picture of human beings. The ideal city is conceivable, but humans are psychologically unable to create and sustain such a city. According to this charge, then, Plato’s ideal constitution is a nowhere-utopia (ou-topia = “no place”). But if ‘ought’ implies ‘can’, then a constitution that cannot exist is not one that ought to exist. So, the objection goes, Plato’s ideal constitution fails to be an ideal-utopia (eu-topia = “good place”).