Egg Sculptures

With Easter approaching, the St. George branch of the Washington County Library has a display of egg sculptures. Some of these eggs are pretty intricate. I don't know how they do it. Of course, I'm kinda stuck between the fascination of some of the designs-one egg has a cool castle cut out of it-, and the practical question of why? What is the purpose of doing it in the first place? The sculptures themselves do not serve a purpose.