We’ve all said it: “The world would be a better place if there were more people like me!” Oh? Really? How many identical siblings would be enough? Would you clone yourself endlessly if you could? Who would raise those numerous newborn clones? Running just under an hour, Caryl Churchill’s 2002 play A Number really should be paired with another play but never is, which kinda-sorta is a cheat for a full-price ticket. Still, it remains intellectually and emotionally provocative with the right director and actors, and the trio of Robin Witt (director), William Brown and Nate Burger are excellent choices. Although A Number has been seen in Chicago before, it remains a timely and pertinent play. Tickets: http://WritersTheatre.org; $50-$70