Hindsight bias, the inclination to see events that have already occurred as being more predictable than they were before they took place Egg of Li Chun, a Chinese egg-balancing tradition Tesla's Egg of Columbus, a metal egg that stands on end in a rotating magnetic field Columbus Breaking the Egg, an engraving by William Hogarth Egg of Columbus (tangram puzzle) Egg of Columbus (mechanical puzzle) Superegg, an egg-like toy designed by Piet Hein that stands on its ends Gömböc Gordian Knot Väinämöinen in Kalevala was asked to tie an egg into a knot, in which he succeeded