In 1930, Illinois Central (“The Road of Travel Luxury”) issued a guide called Chicago: The Vacation City with an opening quote from Illinois poet Carl Sandburg: “Come and show me another city with lifted head so proud to be alive.” The cover is a sleek, mostly light-blue-and-white watercolor by Chicagoan Paul Proehl, who threw in touches of orange, black, gray, and light green for contrast. Two young women stride forward from a Lake Michigan park with a brand-new sculpture in the background, drawn in idealized fashion. They wear the latest, somewhat revealing (for the day) clothing, wind-whipped for Windy City effect. And there’s a suggestive, modern skyscraper silhouette in the background. The guide suggests that if you take the train to Chicago, you’ll find there the allure of fashion, modernity, and daring architecture. And you can get around on the El, don’t forget. Who needs a car? Well, someone does, since there’s the suggestion of a nifty, long-nosed auto peaking from behind the statue. Proehl beautifully captured the urban landscape, not the natural, plus modernity and sex appeal.