While we can’t usually observe coastal currents from the shoreline, water in the oceans of the world is in constant motion.

When most of us look out at the ocean, we see a mostly flat blue surface stretching to the horizon. It’s easy to imagine the sea beneath as calm and largely static – a massive, still abyss far removed ...

Far away from California's coast, where the Pacific Ocean currents swirl, the blue of the sea was replaced by fishing nets, buckets, buoys, laundry baskets and unidentifiable pieces of plastic that ...