Postcolonial studies have made Caliban a symbol of every colonized and oppressed people. Indeed, the fact that Caliban is a native to the island, while Prospero is actually a newcomer who enslaves him and forces him to be his servant is use as a parallel for the situation of colonized peoples in African, American and Asian colonies.
A good example of such interpretation is the play A tempest, by black French author Aimé Cesaire. In his version of the Tempest, Caliban is the black slave of a white master whose name is Prospero.