Define the base structure which can be vertexes of a polygon. Press space to run next iteration, or in the custom base editor, to finish. Enable flash to speed up rendering.
Every iteration, it will place a new point midway between all combinations of 2 points. Note that number increases exponentially for every iteration. Enabling "avoid overlaps" will make it around 10x slower, but will reduce the amount of unique points. If double is turned on, it will spawn 2 points for every connection instead of 1, the second one with the reversed interpolation amount.