For the first nine issues of Concrete, Paul Chadwick used the back covers for artwork giving readers a sneak peek at the next issue’s theme. For the tenth and final issue, Chadwick depicted Concrete taking a meditative moment in a lush forest. Part of the joy of reading Concrete is moments like these, where Chadwick illustrates nature.
The final issue of Concrete’s ongoing title was by no means the end. Chadwick switched to a limited series format for subsequent Concrete stories. The longer form allowed him to expand Concrete’s world and life. You can find them individually or as Volumes #3-7 of the Concrete TPB.