Are You Brain-Bound?

Elizabeth Bowen in 1936 on Jane Austen's Darcy:

"Returning again and again to Mr Darcy , one pays Jane Austen the compliment of
deciding there was more to him than she knew. He has that cloudy outline
important characters should have; does not seem to have been 'created' in the
limited brain-bound sense so much as observed fleetingly out of the corner of an
eye, recollected uncertainly, speculated upon."

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'Real' characters in fiction are ghosts in the reader's real life?

Perhaps one should never be "brain-bound"!