In Digital Typography, we were to design a poster showcasing a single letter of the alphabet in either an Art Nouveau or Art Deco style. I dislike Deco, so I went with the former. Referencing a famous poster by Alphonse Mucha and borrowing copy from the blog Better Explained (highly recommended; the guy has a real gift for making difficult topics comprehensible), I created a poster that illustrates how e, the base of natural logarithms, describes growth rates. The Nouveau style, which typically uses naturalist imagery, was a good fit for the concept. The headline typeface is called Boecklin.
Based on a poster by Alphonse Mucha.