Card 259 was inspired by Zoltan Sepeshy. Sepeshy was a Hungarian immigrant who spent much of his life in my home state of Michigan. You can see examples of his work online at the Cranbrook Art Museum and the Smithsonian American Art Museum.
My not-so-trusty Wikipedia list of post office muralists credits Zoltan with one post office mural: Barnyard (Nashville, Illinois). But I happened upon this fantastic story about a mural called Hauling in the Net, which was originally in the Lincoln Park, Michigan post office.