This question is based on selected poems from Wole Soyinka (ed.) poems of Black Africa, E.K. Senanu and T. Vincent (eds.) Selection of African poetry and E.W. Parker (ed.) A Pageant of Longer Poems.
'The cell is a cruel place, sometimes a haven
Nowhere as absolute as the grave.
The poetic device used in these lines from J.P. Clark's 'The Casualties' is