One more shot at clarifying my question, since I've made some headway. In the file attached to THIS post: the system of lines in the foreground is the one I'm working on, in which each 'leg' is shorter or longer depending upon it's distance to the origin of the whole system. The grid system in the background is not dynamic, but it's an example of how I want my dynamic system in the foreground to look in the end. Namely, the background system has faces, and the foreground system doesn't.
My question is this: how to keep the corner lines independent so that they can grow or shrink according to each one's unique distance from the origin, without making them so independent from each other that they don't describe a face?
Thanks!