For Mark O Brien, executive director of the Abbey Theatre, the memories of his first visit to a theatre at age six are still vivid. “I just remember the red velvet, and the smell of alcohol, mixed with cigarette smoke, and the plush red seats. And I think it was that wonder, that sense of lights going down and magic,” he says. O’Brien spoke with me on the Art’s Matters podcast series to talk about the theatre, his love for the medium and his views on how vital theatre is to the Irish psyche.  We were joined by Lynne Parker,…