Trans[foam]ed is a rule-based module aggregation where specific predefined local design decisions set up a path toward a certain global structural evolution. Trans[foam]ed is built using two dimensional interlocking components. The profiles of the components are informed by a hexagonal patterning and three dimensional cell packing. Components are assembled into modules which can ben added and subtracted from the structure, which makes for an interactive evolving spatial piece. People were encouraged to add and remove modules to alter the structure for their specific needs (sun shading, seclusion, etc.) or just for fun.