Human vision has its limitations. Descend into a cave or venture into the woods at night, and the world begins to dim. Add smoke, fog, rain, haze, snow, or dust to the mix, and it becomes next to impossible to see anything, even with the aid of a lantern or headlights. These conditions don’t just challenge people; they blind machines. As autonomous vehicles, robots, drones, and other devices attempt to navigate an array of places and spaces, they can become disoriented.