The symbol 'X' can mean many things – X marks the spot where the treasure is hidden, it's a kiss at the end of a text, a place to put your signature, a mathematical symbol.
Vona Groarke is a major voice in Irish poetry and her most recent collection is called X. She joins Wallace to unpick the meaning of X and to talk about the great legacy of Irish poets.
Vona Groarke is coming to New Zealand for the Dunedin Writers and Readers Festival in May.
She will also be speaking at the Auckland Writer's Festival later that month.
