The Grid overlay class is just that. It's a utility class that draws a grid overlay (or underlay, or even middle-lay--however you want) within your swf during run-time, of specified numbered columns and gutter width. I created this class as a way to assist in maintaining the grid of the layout during the development stage.
The above example is another take on moving particles with perlinNoise. This time I'm containing the particles within a circular boundary by using the logic from my previous post, Mirrored Circular Motion in AS3, to regenerate particles on the opposite side of the circle. This experiment, as well as the rest of my perlin particle experiments, inspired by the magic Robert Hodgin created with his Weird Fishes video.