Conceptually, these two systems reside in the territory between field and surface. Both are inseparable from the spatial order of a building program and are infrastructural as well as formal. Most importantly, both surfaces offer practical, performative solutions that align with the literal and philosophical implications of cyclically relational forces. The surfaces are animate, literally and phenomenally. A facade surface dynamically mediates with conflicting requirements for natural light and conveyance of large-scale urban graphics. An energy-harvesting surface allows the deviation between reflective trough and heated coil by retaining a parabolic contour curve throughout teach element.