Nature is an inexhaustible source of knowledge. After 3 billion years of evolution, it has created amazing mechanisms, even at a microscopic level, that allow plants and animals around us to protect themselves, to grow, to move or to face the attacks of the elements. This "nanoworld" questions our imagination with its beauty and intelligence. Scientists have finally managed to unravel its mysteries, thanks to photonics. Let’s take an unprecedented journey into this other dimension, in which nature-inspired solutions are found to meet the meet the ecological and climatic challenges that threaten us.