The editor working on the book was looking for a picture of the Gateway Arch. It so happened that the two of us were going to be in St. Louis for a conference, so I suggested that I could take a picture so that we wouldn't have to pay for a stock photo.
So we went to St. Louis last week and took some pictures while walking along a bridge to Illinois.
Here is the picture that they've decided to use in the book:
And here it is as it might appear in the book, slightly cropped and in grayscale:
(We'll probably lighten it up a bit for the book.)