'Tip of the Iceberg' is a series of photographs of icebergs and ice structures in Iceland, highlighting the burning issue of the effects of global warming on the icecaps and life in the northern hemisphere. Icebergs are a prominent feature in native Icelandic culture; they represent danger for ships and terror for the population in the northern regions as they can bring rampaging polar bears to the shore. Middleton was drawn to their sculptural shapes and capturing their luminosity. She also is fascinated by the idea that only the very tip of the iceberg is visible. As Ernest Hemingway wrote ‘Just like an iceberg remains largely unseen beneath the surface, a writer can leave parts of a story unwritten.’