A year in the life of That Tree, a photo a day by Mark Hirsch
Day 101, July 2, 2012. In a timed exposure captured on an iPhone 4S using the iPhone app SlowShutter, the flight paths of fireflies leave yellow brush strokes as they fly in and around That Tree at dusk. That Tree is an ancient Bur Oak growing on the edge of a cornfield near Platteville, WI.
(via suzukichiyo)