Geb, son of Tefnut and Shu, brother of Nut, father of Isis, Osiris, Nephthys and Set, was the god of the earth. Geb is often to be seen as a man with a goose atop his head In many places Geb is referred to as the "Great Cackler" who was supposed to have laid the egg from which the world sprang. Possibly, as a result of this, Geb is known as the "father of the gods". Isis his daughter was sometimes named "the egg of the goose". From the Book of the Dead: Spell 26 "May Geb, chief of gods, throw open his jaws for me, open my eyes which were closed, stretch out my legs for me ....." Spell 29A "May I be in the body of my father Geb and of my mother Nut as I have committed no sins against the gods ..." In the 21st Dynasty he was often depicted in green as the god of vegetation.