The world’s harbor seals (Phoca vitulina) are masters in seeing through the cloudy coastal waters they call home. Harbor seals may also use an important part of their vision to determine which direction they are moving, even with such an opaque view of the world. New research involving a simulated swim finds that the particles in cloudy water moving across the retina at the back of the seal’s eye can tell them which way they are moving. To examine this, Hanke and the team essentially set up an arcade for seals with a gaming challenge. Once the seals were comfortable with the game, the team kept track of the animals’ choices as they watched the dots in the simulations.