I made an interesting discovery last night as I was building another pattern - this one based on a rectangle. The previous patterns were generated using either a triangle or a hexagon at their center resulting in a symmetrical and equal expansion as they grew. Being four sided, the rectangle can expand symmetrically as well as bilaterally creating a long linear form. More experimentation is required!
Other news -
I've acquired a few 4 x 4's and will start building some full scale mock ups in the next week or so.
I got a call from a guy at the Discovery Channel who works on a show called Daily Planet that is interested in documenting the project for inclusion in a series of "science meets art" stories premiering this fall. Fun!