Kirk here with a little gif that is made up of a picture and a video that I took with my iPhone last night. On the left, a girl is holding a flower called a hotaru bukuro (蛍袋). In English, it can be called a "spotted bellflower" but the literal meaning of the Japanese name is "firefly bag." What you see on the right is a firefly doing its thing inside that very "firefly bag." Actually, I took the photo on the left by mistake; I forgot to turn off the flash. But, now I think it was a rather happy accident, so to speak, because it gives you an idea of what is actually happening.