Cacti are full of contradictions. Although many are found in the driest and most barren environments on earth, some grow exclusively in the branches of the rainforest canopy. Many species bristle with ferocious-looking spines, while other varieties are perfectly smooth. And while they might strike us as the most austere plants on earth, nearly all of them exhibit remarkable floral displays - some even larger than the plant itself. In 'Cactus', Dan Torre explores these unique plants as they appear all around the world and throughout art, literature and popular culture.