Further details about the nature of Trumps were revealed as the tale progressed; for example, Trumps are not limited to playing cards, but can be drawn on any surface. Corwin escaped from his dungeon cell after Dworkin materialized in it, by persuading Dworkin, who was mentally unbalanced at the time, to draw him a picture of the lighthouse at Cabra, a location on the edge of Amber. After Dworkin draws another picture to return to his hideout, Corwin uses the lighthouse picture to escape. In "The Hand of Oberon" Corwin returns to his cell and uses the other picture to follow Dworkin to his lair, finding that it is in located near the Primal Pattern that created Amber and all its Shadows.