The snap of a camera's shutter can capture something faster than the blink of an eye, preserving a tiny moment for all time. But cameras work the other way, too, and can capture the world in a way that we never see. Long exposure photography allows the light to pass into the camera for a longer period of time, creating swirling, glowing effects as though the light is a tangible object in space. With this technique, planes become threads of light, fireworks take on the appearance of strange flowers, and fireflies leave trails of light into the forest that are...