CHICAGO—You don’t have to be a kid to enjoy “The SpongeBob Musical,” but it helps a lot if you’re young at heart. After all, this show, which just opened at The Chopin Studio Theatre in Chicago, is based on an animated cartoon character that has appealed to children enthralled by the humorous zaniness and madcap adventures of a sea sponge and his aquatic friends.  
Indeed, during the musical, presented by Kokandy Productions, an 11-year old youngster sitting next to me explained that she loves SpongeBob because he makes her laugh. After watching this revival, I had to agree with her. …