“They are begging us, you see, in their wordless way, / to do something, to speak on their behalf / or at least not to close the door again. / Lost people of Treblinka and Pompeii! / ‘Save us, save us,’ they seem to say.”The first half of the final stanza of Derek Mahon’s epic 1975 poem, A Disused Shed in Co Wexford, attempts to describe the whole of the human condition through the lens of a colony of wild mushrooms, held captive in the eponymous disused shed. Treblinka invokes the man-made disaster and Pompeii, the natural kind. I visited...