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[[Freud]] called the [[development|period]] between [[development|three and five years of age]] the "[[phallic phase]]." The [[phallic phase]] denotes a [[stage]] in [[development]] in which the [[child]] ([[boy]] or [[girl]]) knows only one [[biology|genital organ]] - the [[phallus|penis]]. At this stage, infants of both sexes are dominated by the question of who possesses a penis and the related issue of its masturbatory jouissance (gratification). [[Freud]] argues that children of both [[sexual difference|sexes]] set great value on the [[phallus|penis]], and that their discovery that some [[human]] [[being]]s do not possess a [[phallus|penis]] leads to important [[psyche|psychical]] consequences. Up to this point, the mother is imagined as having a penis, and the discovery that she lacks a penis, after an initial denial, precipitates the castration complex.