When an exhibition shows work of a high technical caliber, you could call it successful. When it shows work that’s conceptually sound, that’s another mark of success. And when it gives you ideas to chew on about current world events, you know it’s solid work. Rob Matthews’ Dawn-Watchers Watch for the Dawn at David Lusk Gallery could check off boxes in all three of these categories — a rare feat. But great art isn’t just about checking off boxes, and Matthews’ exhibit appeals to the part of your brain that’s drawn to pretty candy-colored arrangements just as much as it does to the chin-stroking intellectual portion of your mind, and that’s what makes it the most exciting exhibit by a Nashville-based artist I’ve seen so far this year.