“According to legend, an egg will only balance on its end on the Vernal Equinox”Source: BBC.com
C.G Jung on Egg Symbolism:
The egg is a germ of life with a lofty symbolical significance. It is not just a cosmogonic symbol — it is also a “philosophical one”. As the former it is the Orphic Egg, the world’s beginning; as the latter, the philosophical egg of the medieval natural philosophers, the vessel from which, at the end of the opus alchymicum, the homunculus emerges… the spiritual, inner, and complete man.
in Archetypes of the Collective Unconscious