You've surely seen a "light painting" photograph by now. Sprint made it very popular in their latest advertising campaign, but it's been around for a long time, Picasso made a light painting in 1949. In this tutorial Ben shows us how to easily recreate this effect using particles in After Effects.
This effect is loosely based off the traditional method of shooting still photographs with a slow exposure to capture the motion path of a light. This tutorial is filled with many small tips and tricks for Adobe After Effects to enhance the average user's knowledge and speed up their workflow. If you would like some footage to experiment with, you can download the footage here