Opening an ice cream store in Chicago is not for the faint of heart. Factor in a mostly deserted neighborhood and the Great Depression, and the idea of selling ice cream looks utterly harebrained. Yet that's exactly what the Sapp family did in 1926 when they started Original Rainbow Cone, and their signature treat—five flavors arranged in diagonal slabs—has come to symbolize spring and summer for generations of Chicagoans who grew up on the city's south side.