The traditional formal garden is western in origin and lacking in sustainability. It strives for symmetry through geometry. This is interesting because nature is very ordered, mathematical and symmetric in its individual parts, but not as a whole. The growth of all vegetation is natural, almost chaotic seeming, and certainly not perfectly geometric. The idea of formal gardens is almost silly, constantly trimming and shaping nature into something that it is not, something almost man-made. You can not contain nature.