Feathery white clouds fill the boundary between the dark and light blue regions on the
Great Dark Spot. The spiral shape of both the dark boundary and the white cirrus
suggests a storm system rotating counterclockwise. Periodic small-scale patterns in the
white cloud, possibly waves, are short-lived and do not persist from one Neptunian
rotation to the next. Depicted here is the last face-on view of the Great Dark Spot that
Voyager 2 made with its narrow-angle camera. The image was shuttered 45 hours
before closest approach.