All rectangles contain perfect circles, squares and isosceles triangles in addition to their own ovals, rectangles and non-isosceles triangles. (Ignoring Platonic Solids for this discussion.) In other words, the asymmetry introduced with the PT geometry brings an evolution of form to a level of greater complexity—more options, more possibilities—that enriches the creative expressive possibilities of a forming ST.
Multiply this repeatedly and you end up with a dahlia, a galaxy, a cosmos!
Together, the symmetric and asymmetric instructions sets of the ISL and PTs—respectively—give rise to the expression of ST.