Grid-08, as with a few of the gridz we've seen so far, uses repetition over a diagonal axis. In this case half of the elements in the piece are duplicated and rotated 180-degrees.
Grid-07 is composed of 5 shapes reflected over diagonal axis. Two of these shapes have more than 4 sides and are more complex than most of the shapes used in previous gridz.
Grid-6 uses a larger variety of shapes than any of the gridz before it. Its elements are mostly spread out in a reflecting manner over the y axis, with one minor exception: the borders.
