In Gaiman's Sandman universe, the biblical Cain and Abel live in the Dreaming at Dream's invitation. This is based on the verse in the Bible which says that Cain was sent to live in the Land of Nod. They live as neighbors in two houses near a graveyard: Cain in the broad House of Mystery and Abel in the tall House of Secrets. According to their appearance in Swamp Thing, the difference is that 'a mystery may be shared, but a secret must be forgotten if one tries to tell it'.
in gaiman's sandman universe the biblical cain and abel live in the dreaming at dream's invitation this is based on the verse in the bible which says that cain was sent to live in the land of nod they live as neighbors in two houses near a graveyard cain in the broad house of mystery and abel in the tall house of secrets according to their appearance in swamp thing the difference is that 'a mystery may be shared but a secret must be forgotten if one tries to tell it'