Sprout I/O is a kinetic fur that can capture, mediate, and replay the physical impressions we leave in our environment. It combines embedded electronic actuators with a texturally rich substrate that is soft, fuzzy, and pliable to create a dynamic structure where every fur strand can sense physical touch and be individually moved. By developing a composite material that collocates kinetic I/O, while preserving the expectations that we normally have from interacting with physical things, we can more seamlessly embed and harness the power of computation in our surrounding environments to create more meaningful interfaces for our personal and social activities.