if Snow White is imprisoned in a glass coffin, she is shut off from life as far as feeling, but not as far as awareness, is concerned. If you are in a glass house, you can see and be aware of everything that goes on outside, but you are cut off from the smells, the temperature, the wind
Von Franz establishes the glass coffin as the paradigmatic symbol of an intellectual system that preserves awareness while severing the feeling function and all sensory relatedness to life.
, The Problem of the Puer Aeternus, 1970thesis