Why can’t a regularly shaped basket flowing over with produce be a cornucopia? Why is a cornucopia always horn-shaped? The cornucopia dates back to the birth of Zeus – so says Greek mythology.
Baby Zeus was hidden from sight of his violent father Cronus. He grew up in the mountains where the goat Amalthea was one of his care-takers. Baby Zeus was particularly strong, even as an infant, and accidentally broke off one of the horns of Amalthea. The horn from the nurse-maid produced a wonderful, never-ending abundance of food.
Cornucopia actually means ‘horn of plenty’, cornu copiae.