The primal processes of projection and introjection, being inextricably linked with the infant’s emotions and anxieties, initiate object-relations: by projecting, i.e. deflecting libido and aggression on to the mother’s breast, the basis for object-relations is established
Klein argues that projection and introjection of the maternal breast — in its good and bad aspects — constitute the primordial matrix of all object relations, with persecutory anxiety and idealization structuring the paranoid-schizoid position.
, Envy and Gratitude and Other Works 1946-1963, 1957thesis