This book is comprised of two parts, both of which explore modular
systems: Pipe-Z (PZ) and Truss-Z (TZ), respectively. It presents several
methods of creating PZ and TZ structures subjected to discrete
optimization. The algorithms presented employ graph-theoretic and
heuristic methods. The underlying idea of both systems is to create
free-form structures using the minimal number of types of modular
elements. PZ is more conceptual, as it forms single-branch mathematical
knots with a single type of module. Conversely, TZ is a skeletal system
for creating free-form pedestrian ramps and ramp networks among any
number of terminals in space. In physical space, TZ uses two types of
modules that are mirror reflections of each other. The optimization
criteria discussed include: the minimal number of units, maximal
adherence to the given guide paths, etc.