What is in this image? Describe it as if you were explaining it to someone from the 15th century.

In the image before you is a drawing of an egg, but not one from any creature you would know. This egg is ornate, adorned with careful patterns and markings that are reminiscent of the decorations and embellishments seen in sacred texts or the artful tapestries found in grand halls. Behold lines that wave like the gentle seas, circles that mimic the full moon, and designs that bring to mind the intricacies of cathedral stained glass windows. This object in the drawing is part of a festive tradition, emulating the art of painting and celebrating life and rejuvenation during the springtime. Imagine an egg, not laid by bird or beast, but crafted by human hands as a token of celebration and aesthetic delight.