In these two one-acts, promising young playwright Matt Fotis delivers smart, funny dialogue and honest observation of diverse characters. The weak Shantz Theatre cast, however, undermines the zaniness of The Zebra Baby, in which newlyweds take an odd route to decide to have a baby, and the intricacy of The Van Gogh Exhibit, a nonlinear work introducing interrelated characters in various settings. Here each actor plays at least two or three people, but only Fotis, Scott Danielson, and Sadieh Rifai fully differentiate them; the costuming also makes it difficult to distinguish the shifts in character. Still, these short works provide some sharp humor and a few provocative ideas. Through 1/28: Thu-Fri 7:30 PM, Sat 7:30 and 10 PM, Sun 2 PM, American Theater Company, 1909 W. Byron, 773-369-8566, $12-$15, industry nights Thu.