A pilgrimage is a journey one takes to a place or for a purpose associated with healing. How might Oliver's opening lines of the Wild Geese relate to the idea of a pilgrimage?

Which pair of uses of figurative language from “the caged bird” support the extended metaphor of freedom versus oppression? back of the wind; floats downstream his wings are clipped; his feet are tied the caged bird sings; the free bird thinks dawn bright lawn; grave of dreams