philosophical egg, n.All

The Philosophical egg (n.) echoes ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the Orphic silver egg laid by black-winged Night after the wind fertilized her, holding heaven above and earth below, a cosmos in itself.

The Philosophical egg (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a copy of the World-Egg, white for the waters above the firmament and yolk for the physical world; dividing it with the sword breaks it into the four elements.