Artists Ackroyd & Harvey talk about The Lark Descending exhibition and the fascinating process that’s behind their photographic photosynthesis pieces. This exhibition focuses on Leith Hill through the layers Air | Terra | Soil | Water | Clay | Oil with accompanying talks and workshops. This is part of Surrey Unearthed, a programme of ten projects responding to the natural materials of the Surrey landscape. Interview by Hannah Scott Joynt. Live music ‘The Lark Descending’ by composer Graeme Miller and violinist Calina de la Mare.