1The divergent mechanisms underlying science and art are those of introjection and projection. The scientist deals with his psychical problems in terms of the external universe, the artist in terms of himself. In one thought-processes predominate, in the other body-knowledge and bodily processes.

2These divergent mechanisms are methods of dealing with a common problem, namely, the preservation of the good object and the self from the aggressive phantasies of infancy, due to internal and external frustration, this frustration being experienced at oral stages when self-preservative and libidinal desires were inseparable.