Long exposures can do a number of things for photography. They can smooth out motion, they can convey motion, they can capture light trails, or they can even make moving objects completely disappear. Let's see how you all use your longer exposures with this month's theme. As an example, I'll post this shot I took last month while visiting my alma mater. With tourists and cadets swarming around in front of me, I popped on my 6-stop filter, set a 30 second exposure and the people simply disappeared...