Tracing the Line, a temporary three-night installation, was commissioned by Waller Creek Conservancy to activate Waller Creek—an underappreciated urban watercourse that runs through downtown Austin. (The creek is a hidden gem in the middle of the city that will soon be revitalized through extensive permanent improvements.) The resulting project, equal parts landscape and architecture, encouraged participants to trace a portion of Waller Creek and contemplate the potential and future of the creek’s redevelopment. We proposed an economical solution to a challenging assignment by using a system of portable LED lights along with parts that are easily sourced and readily available. Tracing the Line consisted of a series of thin illuminated tubes emerging from the creek, anchored at approximately 10 foot centers with their tops aligned at a single datum. The glowing portions grew, from north to south, to a maximum length of six feet describing a wedge that matches the estimated six feet of vertical grade that the installation spanned. Although the views within the creek are often obscured, the winding line of suspended luminaires became increasingly visible as the evenings progressed into night, drawing people down the normally underutilized creekside walkway in a meandering path through three city blocks. This particular section of Waller Creek from the north side of 6th street, to the south of 9th, features numerous existing vignettes ranging from handcrafted early 1900’s stonework bridge/tunnels and utilitarian cement overpasses to natural limestone creek beds. With luminous restraint, Tracing the Line succeeded in connecting, as well as highlighting these disparate areas of interest.