CA Locust Bark is a composite of photographic source material and a 2D rendering of one-dimensional Second-order Cellular Automata (CA). We observed that some second-order CA renderings exhibited similar repeating patterns of dark and light seen in bark striations. For this quilt series, we photographed aspen, birch, oak, pine, sycamore and locust tree bark looking for line and form that harmonize with the CA output. CA rendered lines and shapes, most dominant among them a repeating triangle, pierce the photographic image through luminance masks. Resulting linear elements are further emphasized with metallic quilting thread in charcoal, rose and silver. $2100 34.5h x 25w