Waves
摘要
A gardener holds the end of a hose and flicks his wrist, creating a squiggle in the hose that travels away from his hand to the hose’s other end. A fish breaks through the surface of a pond, making ripples that spread in all directions until they reach the shore. A group of spectators at a baseball game stand up and raise their arms over their heads, starting a bump in the crowd that propagates all the way around the stadium.