This evolutionary strategy sufficed for many millions of years, until humans came on the scene with their fire and electricity. When insects encounter an outdoor bulb after dusk, confusion reigns. They tilt their backs toward the bulb as if it were the sky and initiate endless, sometimes erratic loops around it. With light pollution increasing and with drastic declines in insect numbers worldwide, new forms of lighting may be needed to preserve these populations, which are integral to the health of global ecosystems.