Overall winner: Fractal Forest Inside-out view of a cauliflower soft coral. Named for its characteristic appearance that resembles a cauliflower, with numerous small, rounded, bump-like polyps that give it a puffy texture. Photograph: Ross Gudgeon ‘Giving us a unique perspective on coral. There’s nothing fake here, but still we ponder, is this nature or a painting?’ An exhibition is on now at the South Australian Museum