The Crypt at St Luke’s, Cork Luke Casserly’s playful, participatory exploration of Ireland’s 10,000-year-old bogs involves touch, sound, taste – and an earthy perfume Seated at a circular table covered in a mound of dried peat, writer and performer Luke Casserly might be presiding over an arcane ritual. When he holds a handful of peat in his hand and passes it to the small audience around the tab…