A great deal has been written on the topic as it relates to psychoanalysis, especially as a part of the sweeping interest in narcissism; indeed, from a psychoanalytic perspective, disturbances of self-esteem belong to the realm of narcissistic disorders. With the coming of the Enlightenment and the aesthetic and moral idealism of Kant and Schiller, the notion of an individual's self-worth was transformed and internalized. The patterns of fantasy described by Stern - fantasies etched by interactions between the self and the "self-regulating other" (RIGs) - are tremendously important in the psychogenesis of self-esteem - that is, in its emotional birth and the development of its various manifestations. The so-called "grandiose self", whose effects are largely unconscious, is a factor underlying a variety of disturbances of self-esteem. Kohut believes the grandiose self represents a fixation at the stage of an archaic yet normal childhood self characterized by unlimited - albeit illusory - omnipotence and omniscience.