Sky lanterns, also known as Chinese lanterns, are often used in celebrations and events for their visually captivating display. When they fall, it's usually because the heat source within the lantern, typically a flame, has extinguished. This results in the lantern losing its buoyancy, causing it to gently descend back to the ground. It's important to note that while sky lanterns can create a beautiful spectacle, they might also pose potential risks to wildlife, livestock, and property due to their uncontrolled descent and the non-biodegradable materials often used in their construction. This is why it's crucial to consider local laws and environmental factors before releasing sky lanterns.