The tradition of stringing electric lights may have started as a Christmas thing in America, but now it’s a global phenomenon used for all kinds winter festivuses (festivi?). It’s a practice we take for granted—come December, they’re everywhere. The evolution of the Christmas light parallels that of the light bulb, with some remarkably ornate—OK, tacky—variations. But regardless of how they look, one thing’s for certain: They’re a much better option than sticking a candle in a tree.