Geb is the Egyptian earth-god, and Egypt is unusual in making the earth male and the sky, Nut, female, the reverse of the Greek arrangement. He is shown reclining beneath the arched, star-spangled body of Nut, the two held forever apart by Shu, the air, in an image Egyptian cosmology used to explain the space in which life happens.
As the ground itself, Geb's laughter was said to be the trembling of earthquakes, and because the dead are buried in him he had an underworld aspect, holding the deceased and, in the Book of the Dead, capable of imprisoning those who failed their judgment. He is father of Osiris, Isis, Set and Nephthys, and so ancestor of the drama of kingship; the throne of Egypt was called the throne of Geb, and the living king its heir.
Geb's most distinctive epithet, the Great Cackler, ties him to a cosmogonic tradition in which a primordial egg, from which the sun or a first bird emerged, was laid amid a great cackling, a myth that made Geb, as the earth itself, the ultimate source of the egg and so, in some tellings, of creation. The epithet recurs in funerary literature such as the Coffin Texts, where invoking Geb by this name calls on his primal, world-founding aspect rather than his everyday role as the solid ground. Because the dead were interred within Geb's own body, ritual texts extended his function into the embalming process itself, treating the earth-god as a participant in, rather than merely the setting for, the preservation of the dead.