Photographer Yume Cyan has been recasting the fireflies around Nagoya City, Japan, as fairy lights in a series of long-exposure photos. The momentary flashing of each bug becomes part of a bioluminescent trail it winds through the trees.
You can see more (and larger) photos from this series at 500px, where you can also order prints of the photographs.
DISCUSSION
Looks more like multiple exposure than long exposure. With long there would be streaks of light instead of dots.