Traces of pelicans and seagulls crossing the sky

This past week, we took the device to the beach. One afternoon we set the light aside and pointed the camera skyward, leaving it recording the motion of pelicans and seagulls flying by for a couple of hours. The birds and their wings traced such elegant paths across the sky. The multi-exposure traces below were made by importing quicktime films into ImageJ and making Z-projections of the resulting stacks.

One seagull:


Two pelicans:


A couple of hours of birds:


Link to the video