Built around the vision of biodiversity loss as a chain reaction, the International Union for Conservation of Nature (IUCN) Save Our Species (SOS) program visual identity takes shape as a game of domino. Every domino represents one species involved in an ecosystem. If one falls, it drags the next one in its fall, and so on. To illustrate this simple idea, we developed a variable font allowing to set and fit any species name within the rectangular shape of a domino.