Goldfish can live in a fishbowl because they know how.
‘I am afraid,’ replied Elinor, ‘that the pleasantness of an employment does not always evince its propriety.’
– Sense and Sensibility, Jane Austen
But Marlow was not typical (if his propensity to spin yarns to be excepted), and to him the meaning of an episode was not inside like a kernel but outside, enveloping the tale which brought it out only as a glow brings out a haze, in the likeness of one of these misty halos that sometimes are made visible by the spectral illumination of moonshine.
Heart of Darkness, Joseph Conrad