The natural world, although it seems so dazzling, is much richer and more complex than we can perceive. It is full of colors and patterns invisible to our gaze, but fundamental for the creatures that do detect them. Infrared shades, fluorescent flashes, polarized shades and ultraviolet ranges. This rainbow that hides from our eyes, gives organisms their true appearance. It traces codes on its surface, signals intended to communicate with its own or with those of other species. It is the way in which they detect each other, and the way in which they read the environment that surrounds them. Thanks to UV colors: birds of prey detect urine traces of their prey from the air; butterflies and bees identify landing strips drawn on flowers; scorpions find their mates, and carnivorous plants attract their snack. Join us to explore this fascinating field that is revolutionizing our biological understanding. If bioluminescence propelled a paradigm shift regarding life in the deep sea, biofluorescence promises to do it on the surface.