The bell jar shape in this illustration is derived from the shape of the glass dome the little prince places over the rose in order to protect her from the evening chill.
Birth as a metaphor for purpose and drive does not necessarily only happen to the young. It may never happen at all. It is possible, I think, to spend an entire life growing in a small space, facing the wrong direction.
All of us, in ways more or less obscure, feel the need to be born.
Antoine de Saint-Exupéry / Wind, Sand and Stars (1939)