Besides this purely aesthetic reasoning, Freud gives no further argument for the existence of these two opposing instincts—save to (parenthetically) mention "anabolism and katabolism" (56), the cellular processes of building up and breaking down molecules.
alter ego | Et in Arcadia ego | Alter ego | Ego Tripping at the Gates of Hell | Dexter's Laboratory: Ego Trip | Children attempt to move the "Ego Leonard" appearing in 2008 at Brighton Beach near the Brighton Pier |